[PATCH] [AtomicExpand] Set branch weights when new basic blocks are created

[Akira Hatanaka]

This patch fixes AtomicExpand pass to set branch weights when it creates new basic blocks. The weights are set in a way that optimizes for the case where there are few contentions.

http://reviews.llvm.org/D7804

Files:
  include/llvm/Analysis/BranchProbabilityInfo.h
  lib/CodeGen/AtomicExpandPass.cpp
  test/CodeGen/AArch64/arm64-atomic.ll
  test/CodeGen/ARM/atomic-64bit.ll
  test/CodeGen/ARM/cmpxchg-idioms.ll
  test/CodeGen/X86/atomic128.ll
  test/Transforms/AtomicExpand/ARM/atomic-expansion-v7.ll
  test/Transforms/AtomicExpand/ARM/atomic-expansion-v8.ll
  test/Transforms/AtomicExpand/ARM/cmpxchg-weak.ll
  test/Transforms/AtomicExpand/X86/atomic32-weight.ll
  test/Transforms/AtomicExpand/X86/lit.local.cfg

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