[PATCH] [CodeGen] Don't cast and use SizeTy instead of Int32Ty when constructing {extract, insert} vector element instructions.

[Michael Spencer]

Hi rsmith,

With this patch the following code is able to be correctly optimized.

  #include <x86intrin.h>
  #include <immintrin.h>
  #include <avxintrin.h>
  #include <avx2intrin.h>
  #include <cstdio>
  #include <cinttypes>
  
  __m128 bss4( const __m128 *ptr, size_t i, size_t j )
  {
      float f = ptr[i][j];
      return (__m128) { f, f, f, f };
  }

Previously an unneeded trunc + zext would be emitted.

http://reviews.llvm.org/D3974

Files:
  lib/CodeGen/CGBuiltin.cpp
  lib/CodeGen/CGExpr.cpp
  lib/CodeGen/CGExprScalar.cpp
  test/CodeGen/builtinshufflevector2.c
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