[PATCH] [IR] Make {extract, insert}element accept an index of any integer type.

[Michael Spencer]

Updated serialization.

I audited all uses of {Insert,Extract}ElementInst and nothing makes assumptions about the type other than the bitcode reader/writer. There are lots of cases of generating a constant index, and these always use i32, but this is fine.

There are no changes needed to selection dag because it is lowered with:

  SDValue InIdx = DAG.getSExtOrTrunc(getValue(I.getOperand(1)),
                                     getCurSDLoc(), TLI.getVectorIdxTy());

So the rest of the backend already sees the type it is expecting.

http://reviews.llvm.org/D3519

Files:
  docs/LangRef.rst
  lib/Bitcode/Reader/BitcodeReader.cpp
  lib/Bitcode/Writer/BitcodeWriter.cpp
  lib/IR/Constants.cpp
  lib/IR/Instructions.cpp
  test/CodeGen/X86/vec_splat.ll
  test/Feature/instructions.ll
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