[PATCH] [AArch64] Inline memcpy() as a sequence of ldp-stp with 64-bit registers

[Sergey Dmitrouk]

Addressed some of comments (will comment on the rest):

1. Fix typo `s/af/as`.
2. `NumSequences` => `NumLdStSequencesUpdated`.
3. Fixed rather confusing comment.
4. Removed extra curly braces around body of single-line `if` statements.

http://reviews.llvm.org/D6054

Files:
  lib/Target/AArch64/AArch64.h
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64LoadStoreInterleave.cpp
  lib/Target/AArch64/AArch64TargetMachine.cpp
  lib/Target/AArch64/CMakeLists.txt
  test/CodeGen/AArch64/arm64-variadic-aapcs.ll
  test/CodeGen/AArch64/arm64-virtual_base.ll
  test/CodeGen/AArch64/func-calls.ll
  test/CodeGen/AArch64/memcpy-f128.ll
  test/CodeGen/AArch64/optimal-load-store-pairs.ll
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