[PATCH] D10936: AMDGPU: Avoid using 64-bit shift for i64 (shl x, 32)

[Matt Arsenault]

Use truncate instead of extract_element x, 0
Add tests for lshr x, 32 case


http://reviews.llvm.org/D10936

Files:
  lib/Target/AMDGPU/AMDGPUISelLowering.cpp
  lib/Target/AMDGPU/AMDGPUISelLowering.h
  test/CodeGen/AMDGPU/array-ptr-calc-i64.ll
  test/CodeGen/AMDGPU/mul_uint24.ll
  test/CodeGen/AMDGPU/shl.ll
  test/CodeGen/AMDGPU/srl.ll

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