Fix thumbv4t indirect calls

So there are a couple of issues with indirect calls on thumbv4t. First, the most
'obvious' instruction, 'blx' isn't available until v5t. And secondly, the
next-most-obvious sequence: 'mov lr, pc; bx rN' doesn't DTRT in thumb code
because the saved off pc has its thumb bit cleared, so when the callee returns
we end up in ARM mode.... yuck.

The solution is to 'bl' to a nearby landing pad with a 'bx rN' in it.

We could cut down on code size by sharing the landing pads between call sites
that are close enough, but for the moment let's do correctness first and look at
performance later.


Patch by: Iain Sandoe

http://reviews.llvm.org/D6519


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223380 91177308-0d34-0410-b5e6-96231b3b80d8
Fix yet another unseen regression caused by r223113

r223113 added support for ARM modified immediate assembly syntax. Which
assumes all immediate operands are prefixed with a '#'. This assumption
is wrong as per the ARMARM - which recommends that all '#' characters be
treated optional. The current patch fixes this regression and adds a test
case. A follow-up patch will expand the test coverage to other instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223381 91177308-0d34-0410-b5e6-96231b3b80d8
[AArch64] Combining Load and IntToFp should check for neon availability


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223382 91177308-0d34-0410-b5e6-96231b3b80d8
[x86] Fix isOffsetSuitableForCodeModel kernel code model offset

Offset == 0 is a valid offset for kernel code model according to the
x86_64 System V ABI. Found by inspection, no testcase.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223383 91177308-0d34-0410-b5e6-96231b3b80d8
Silence warning: variable 'buffer' set but not used.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223389 91177308-0d34-0410-b5e6-96231b3b80d8
Add a FIXME as requested by Renato Golin.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223390 91177308-0d34-0410-b5e6-96231b3b80d8
Also use --icf=safe if we are being linked by gold.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223394 91177308-0d34-0410-b5e6-96231b3b80d8
Add some tests for SimplifyCFG's ConstantFoldTerminator(). NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223395 91177308-0d34-0410-b5e6-96231b3b80d8
Add some tests for SimplifyCFG's TurnSwitchRangeIntoICmp(). NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223396 91177308-0d34-0410-b5e6-96231b3b80d8
Debug info: If the RegisterCoalescer::reMaterializeTrivialDef() is
eliminating all uses of a vreg, update any DBG_VALUE describing that vreg
to point to the rematerialized register instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223401 91177308-0d34-0410-b5e6-96231b3b80d8
Fix UBSan report in StringMap implementation.

Use offsetof() instead of a member access within null pointer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223402 91177308-0d34-0410-b5e6-96231b3b80d8
Simplify implementation and testcase of r223401 based on feedback from dblaikie.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223405 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "Fix UBSan report in StringMap implementation."

This reverts commit r223402. Some bots fail with -Winvalid-offsetof
warning.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223407 91177308-0d34-0410-b5e6-96231b3b80d8
Convert test to use an extra Input file. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223414 91177308-0d34-0410-b5e6-96231b3b80d8
[X86] Delete dead code in fcopysign lowering. NFC.

r32900 introduced custom lowering for fcopysign, with two checks to
change the magnitude value's type if it's larger/smaller than the sign
value's type.  r32932 replaced that code for the smaller case.
r43205 did the same for the larger case, but left the old code, now dead.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223415 91177308-0d34-0410-b5e6-96231b3b80d8
Re-add support to llvm-objdump for Mach-O universal files and archives with -macho
with fixes.  Includes the move of tests for llvm-objdump for universal files to an X86
directory.  And the fix where it was failing on linux Rafael tracked down with asan.
I had both Jim Grosbach and Adam Hemet look over the second fix since I could not
set up asan to reproduce with the old version but not with the fix.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223416 91177308-0d34-0410-b5e6-96231b3b80d8
Add a few extra cases to the test. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223417 91177308-0d34-0410-b5e6-96231b3b80d8
Move merging of alignment to a central location. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223418 91177308-0d34-0410-b5e6-96231b3b80d8
Both of these subtargets have functions that check whether or
not the target is mach-o. Use them.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223420 91177308-0d34-0410-b5e6-96231b3b80d8
Rename the x86 isTargetMacho to isTargetMachO for uniformity.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223421 91177308-0d34-0410-b5e6-96231b3b80d8