- Refactored ARMTargetInfo in order to use the API of llvm/lib/Support/TargetParser.cpp

  for extracting target specific information.
- Patch for commit 241267: ShouldUseInlineAtomic was set incorrectly when subArch was
  not specified, causing regressions.

Change-Id: Iabb35d59722f4972f1a3ab4365880add5bbcfdcc

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@241343 91177308-0d34-0410-b5e6-96231b3b80d8