MS ABI: Add tests, other cleanups for r204562

This commit cleans up a few accidents:
- Do not rely on the order in which StringLiteral lays out bytes.
- Use a more efficient mechanism for handling so-called
  "special-mappings" when mangling string literals.
- There is no need to allocate a copy of the mangled name.
- Add the test written for r204562.

Thanks to Richard Smith for pointing these out!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204586 91177308-0d34-0410-b5e6-96231b3b80d8
CodeGen: Remove unneeded directives

Use two check-prefix patterns per FileCheck invocation for these tests,
this cleanly removes redundant CHECK directives.

Thanks to Richard Smith for the idea!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204587 91177308-0d34-0410-b5e6-96231b3b80d8
Driver: Fix a typo in a command line description

Thanks to Richard Smith for catching this!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204588 91177308-0d34-0410-b5e6-96231b3b80d8
Revert r204562,204566,204586,204587 as they broke ASan on Windows

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204596 91177308-0d34-0410-b5e6-96231b3b80d8
Fix a compile-time warning

lib/CodeGen/CGBuiltin.cpp:3136:12: warning: variable ‘TblPos’ set but not used [-Wunused-but-set-variable]

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204599 91177308-0d34-0410-b5e6-96231b3b80d8
AArch64_BE test case for predefined macros

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204604 91177308-0d34-0410-b5e6-96231b3b80d8
Update DataLayout/DescriptionString for ppc64le
Update DataLayout/DescriptionString for ppc64le

Similar LLVM change made in r203664

Testcase included.




git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204613 91177308-0d34-0410-b5e6-96231b3b80d8
Update the parameters passed to the assembler and linker for
the PPC64LE target.  Specifically:
(assembler) adds/uses  -mppc64 -mlittle-endian
(linker) adds/uses  elf64lppc

Testcase included.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204626 91177308-0d34-0410-b5e6-96231b3b80d8
[PPC64LE] Add a CALL_ELF macro to indicate use of the ELFv2 ABI.

Additional clarification from Uli for the background on _CALL_ELF:
"Historically GCC has provided various _CALL_... predefines depending on the
ABI currently being compiled for. (_CALL_SYSV,_CALL_AIXDESC, _CALL_DARWIN )
When we needed a new define for the current ABI, we decided on using _CALL_ELF
since the official name of the ABI is the OpenPower ElfV2 ABI, with the
current Linux ABI retro-actively being renamed the ELFv1 ABI
and so we decided on using _CALL_ELF to identify the Linux (+BSD etc.) ELF ABI,
with _CALL_ELF=1 for the v1 ABI and _CALL_ELF=2 for the v2 ABI.
(Note that this matches the gcc compiler switch -mabi=elfv1 vs. -mabi=elfv2)."

In code, a (_CALL_ELF==2) check will indicate when the ELFv2 ABI is
to be used.   This is the desired default for the PPC64 LE target.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204627 91177308-0d34-0410-b5e6-96231b3b80d8
Use CHECK-DAG in a test so that it isn't sensitive to metadata order.

This was failing on an internal branch where the order was different for
some reason. <rdar://problem/16407581>

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204633 91177308-0d34-0410-b5e6-96231b3b80d8
Capability attributes can now be declared on a typedef declaration as well as a structure declaration. This allows for C code to use Boolean expressions on a capability as part of another attribute. Eg) __attribute__((requires_capability(!SomeCapability)))

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204657 91177308-0d34-0410-b5e6-96231b3b80d8
Update the powerpc64le check to include CALL_ELF=2 check.
This is a testcase follow-up to r204627.
(see also r204614 for CALL_ELF usage).





git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204669 91177308-0d34-0410-b5e6-96231b3b80d8
Cleanup testcase by adding return statements and replacing CHECK-DAG's with
plain old CHECKs.

Follow-up to r204633.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204670 91177308-0d34-0410-b5e6-96231b3b80d8
[MS-ABI] Drop Special Layout in 64-bit mode.

As of cl.exe version 18, the special layout rules for structs with 
alignment 16 or greater has been dropped.  This patch drops the behavior 
from clang.  This patch also updates the lit tests to reflect the 
change.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204674 91177308-0d34-0410-b5e6-96231b3b80d8
MS ABI: Eliminate Duplicate Strings

COFF doesn't have mergeable sections so LLVM/clang's normal tactics for
string deduplication will not have any effect.

To remedy this we place each string inside it's own section and mark
the section as IMAGE_COMDAT_SELECT_ANY.  However, we can only do this if the
string has an external name that we can generate from it's contents.

To be compatible with MSVC, we must use their scheme.  Otherwise identical
strings in translation units from clang may not be deduplicated with
translation units in MSVC.

This fixes PR18248.

N.B. We will not attempt to do anything with a string literal which is not of
type 'char' or 'wchar_t' because their compiler does not support unicode
string literals as of this date.  Further, we avoid doing this if
either -fwritable-strings or -fsanitize=address are present.

This reverts commit r204596.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204675 91177308-0d34-0410-b5e6-96231b3b80d8
Proper handling of static local variables with address space qualifiers.

Similar to the implementation for globals in r157167.

Patch by Jingyue Wu.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204677 91177308-0d34-0410-b5e6-96231b3b80d8
Fix a bug where an explicit instantiation declaration of a class template
specialization would make us think it might have a key function.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204686 91177308-0d34-0410-b5e6-96231b3b80d8
Simplify: don't try to complete the list of decls twice when iterating over the
lookups for a DeclContext.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204691 91177308-0d34-0410-b5e6-96231b3b80d8
If a DeclContext's lookups need to be reconciled, and we're given external declarations for a name, reconcile first. Otherwise, when we come to reconcile, we'll ask for external declarations for that name again. No functionality change intended.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204692 91177308-0d34-0410-b5e6-96231b3b80d8
Save out a correct lookup table if a lookup table entry is stale (it contains
an out-of-date external decls list). This happens if we declare some names,
force the lookup table for the decl context to be built, import a module that
adds more decls for the name, then write out our module without looking up the
name.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204694 91177308-0d34-0410-b5e6-96231b3b80d8