Wording fix for llvm.global_dtors docs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209687 91177308-0d34-0410-b5e6-96231b3b80d8
Factor out comparison of Instruction "special" states.

No functional change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209688 91177308-0d34-0410-b5e6-96231b3b80d8