[AArch64] Address Chad's post commit review comments for r217504 (PBQP experimental support)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217518 91177308-0d34-0410-b5e6-96231b3b80d8
LangRef: @baz should be @bar in the COMDAT example

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217520 91177308-0d34-0410-b5e6-96231b3b80d8
Merge branch 'master', remote-tracking branch 'trunk/master'