[LIT] Add support for `UNSUPPORTED` tag to `TestRunner.parseIntegratedTestScript`

Summary:
This patch gives me just enough to leverage the existing functionality in `TestRunner` for use in `libc++` and `libc++abi` .

It does the following:
* Adds the `UNSUPPORTED` tag to `TestRunner.parseIntegratedTestScript`.
* Allows `parseIntegratedTestScript` to return an empty script if a script is not required by the caller.



Reviewers: ddunbar, EricWF

Reviewed By: EricWF

Subscribers: cfe-commits, llvm-commits

Differential Revision: http://reviews.llvm.org/D6589

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223915 91177308-0d34-0410-b5e6-96231b3b80d8
Use unique_ptr instead of DeleteContainerSeconds.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223918 91177308-0d34-0410-b5e6-96231b3b80d8
InstSimplify: div %X, 0 -> undef

We already optimized rem %X, 0 to undef, we should do the same for div.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223919 91177308-0d34-0410-b5e6-96231b3b80d8
[X86] Make a code path in EltsFromConsecutiveLoads work only on vectors it expects

EltsFromConsecutiveLoads was apparently only ever called for 128-bit vectors, and assumed this implicitly. r223518 started calling it for AVX-sized vectors, causing the code path that had this assumption to crash.
This adds a check to make this path fire only for 128-bit vectors.

Differential Revision: http://reviews.llvm.org/D6579

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223922 91177308-0d34-0410-b5e6-96231b3b80d8
InstSimplify: [al]shr exact undef, %X -> undef

Exact shifts always keep the non-zero bits of their input.  This means
it keeps it's undef bits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223923 91177308-0d34-0410-b5e6-96231b3b80d8
ConstantFold: div undef, 0 should fold to undef, not zero

Dividing by zero yields an undefined value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223924 91177308-0d34-0410-b5e6-96231b3b80d8
Silencing a -Wsequence-point warning, and the resulting undefined behavior. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223926 91177308-0d34-0410-b5e6-96231b3b80d8
Match new shuffle codegen for MOVHPD patterns

Add patterns to match SSE (shufpd) and AVX (vpermilpd) shuffle codegen
when storing the high element of a v2f64. The existing patterns were
only checking for an unpckh type of shuffle. 

http://llvm.org/bugs/show_bug.cgi?id=21791

Differential Revision: http://reviews.llvm.org/D6586



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223929 91177308-0d34-0410-b5e6-96231b3b80d8
Added documentation for MergeFunctions pass:
Pass looks for equivalent functions that are mergable and folds them.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223931 91177308-0d34-0410-b5e6-96231b3b80d8
[Hexagon] Adding JR class predicated call reg instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223933 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Use getTargetConstant in AdjustRegClass

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223940 91177308-0d34-0410-b5e6-96231b3b80d8
[AArch64] MachO large code-model: Materialize FP constants in code.

In the large code model we have to first get the address of the GOT entry, load
the address of the constant, and then load the constant itself.

To avoid these loads and the GOT entry alltogether this commit changes the way
how FP constants are materialized in the large code model. The constats are now
materialized in a GPR and then bitconverted/moved into the FPR.

Reviewed by Tim Northover

Fixes rdar://problem/16572564.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223941 91177308-0d34-0410-b5e6-96231b3b80d8
Move three methods only used by MCJIT to MCJIT.

These methods are only used by MCJIT and are very specific to it. In fact, they
are also fairly specific to the fact that we have a dynamic linker of
relocatable objects.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223964 91177308-0d34-0410-b5e6-96231b3b80d8
[Hexagon] Adding encodings for JR class instructions.  Updating complier usages.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223967 91177308-0d34-0410-b5e6-96231b3b80d8
ConstantFold: an undef shift amount results in undef

X shifted by undef results in undef because the undef value can
represent values greater than the width of the operands.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223968 91177308-0d34-0410-b5e6-96231b3b80d8
ConstantFold, InstSimplify: undef >>a x can be either -1 or 0, choose 0

Zero is usually a nicer constant to have than -1.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223969 91177308-0d34-0410-b5e6-96231b3b80d8
ConstantFold: Clean up X * undef code

No functional change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223970 91177308-0d34-0410-b5e6-96231b3b80d8
[Hexagon] Adding combine ri/ir instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223971 91177308-0d34-0410-b5e6-96231b3b80d8
Fix PR21694. r219517 added a use of SCEV divide in HowFarToZero computation.  This divide can produce incorrect results as we are using an unsigned divide for what should be a modular divide.  This change reverts back to a more conservative computation using trailing zeros.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223974 91177308-0d34-0410-b5e6-96231b3b80d8
LiveInterval: Use more range based for loops for value numbers and segments.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223978 91177308-0d34-0410-b5e6-96231b3b80d8