SelectionDAG: Teach FoldConstantArithmetic how to deal with vectors.

This required disabling a PowerPC optimization that did the following:
input:
x = BUILD_VECTOR <i32 16, i32 16, i32 16, i32 16>
lowered to:
tmp = BUILD_VECTOR <i32 8, i32 8, i32 8, i32 8>
x = ADD tmp, tmp

The add now gets folded immediately and we're back at the BUILD_VECTOR we
started from. I don't see a way to fix this currently so I left it disabled
for now.

Fix some trivially foldable X86 tests too.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174325 91177308-0d34-0410-b5e6-96231b3b80d8
X86: Simplify code. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174326 91177308-0d34-0410-b5e6-96231b3b80d8
X86: Open up some opportunities for constant folding by postponing shift lowering.

Fixes PR15141.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174327 91177308-0d34-0410-b5e6-96231b3b80d8
Fix some abuses of StringRef

We were taking a StringRef to a temporary result, which can go horribly wrong.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174328 91177308-0d34-0410-b5e6-96231b3b80d8
Disable a couple more vector splat optimizations on PPC.

I didn't see those because the test case used "not grep". FileCheck the test and
XFAIL it, preserving the old optimization, so this can be fixed eventually.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174330 91177308-0d34-0410-b5e6-96231b3b80d8
Hexagon: Add V4 combine instructions and some more Def Pats for V2.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174331 91177308-0d34-0410-b5e6-96231b3b80d8
Replace global std::string with const char[]

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174332 91177308-0d34-0410-b5e6-96231b3b80d8