Rename createGlobalBaseRegPass -> createX86GlobalBaseRegPass to make
it obvious that it's a target specific pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209380 91177308-0d34-0410-b5e6-96231b3b80d8
Remove extra local variable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209381 91177308-0d34-0410-b5e6-96231b3b80d8
Avoid using subtarget features when adding X86 specific passes to
the pass pipeline.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209382 91177308-0d34-0410-b5e6-96231b3b80d8