[PATCH] CodeGen: Give pointer parameters 'align' attributes

[David Majnemer]

Hi rsmith, hfinkel, nicholas, nlewycky,

A pointer passed into a function must be suitably aligned or else risks
undefined behavior.  Pass this information over to the middle end
optimizers by annotating pointer parameters with 'align' attributes.

http://reviews.llvm.org/D5391

Files:
  lib/CodeGen/CGCall.cpp
  lib/CodeGen/CodeGenFunction.h
  lib/Headers/avxintrin.h
  test/CXX/except/except.spec/p14-ir.cpp
  test/CodeGen/address-space-field1.c
  test/CodeGen/arm-arguments.c
  test/CodeGen/arm64-arguments.c
  test/CodeGen/ms-intrinsics.c
  test/CodeGen/nonnull.c
  test/CodeGen/packed-arrays.c
  test/CodeGen/restrict.c
  test/CodeGen/sparcv9-abi.c
  test/CodeGen/stack-protector.c
  test/CodeGen/systemz-inline-asm.c
  test/CodeGen/transparent-union.c
  test/CodeGen/vla.c
  test/CodeGen/x86_64-arguments.c
  test/CodeGenCXX/address-space-ref.cpp
  test/CodeGenCXX/catch-undef-behavior.cpp
  test/CodeGenCXX/constructor-destructor-return-this.cpp
  test/CodeGenCXX/constructor-init.cpp
  test/CodeGenCXX/copy-constructor-elim-2.cpp
  test/CodeGenCXX/copy-constructor-synthesis-2.cpp
  test/CodeGenCXX/copy-constructor-synthesis.cpp
  test/CodeGenCXX/derived-to-base.cpp
  test/CodeGenCXX/dllexport-members.cpp
  test/CodeGenCXX/dllimport-members.cpp
  test/CodeGenCXX/empty-nontrivially-copyable.cpp
  test/CodeGenCXX/fp16-mangle.cpp
  test/CodeGenCXX/implicit-copy-constructor.cpp
  test/CodeGenCXX/mangle.cpp
  test/CodeGenCXX/microsoft-abi-cdecl-method-sret.cpp
  test/CodeGenCXX/microsoft-abi-dynamic-cast.cpp
  test/CodeGenCXX/microsoft-abi-member-pointers.cpp
  test/CodeGenCXX/microsoft-abi-sret-and-byval.cpp
  test/CodeGenCXX/microsoft-abi-structors.cpp
  test/CodeGenCXX/microsoft-abi-virtual-inheritance.cpp
  test/CodeGenCXX/microsoft-abi-vmemptr-conflicts.cpp
  test/CodeGenCXX/pod-member-memcpys.cpp
  test/CodeGenCXX/x86_64-arguments.cpp
  test/CodeGenObjCXX/arc-mangle.mm
  test/CodeGenObjCXX/implicit-copy-constructor.mm
  test/CodeGenOpenCL/address-spaces.cl
  test/OpenMP/parallel_codegen.cpp
  test/Profile/c-unprofiled-blocks.c
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