Skip unreachable blocks for CFIInstrInserter verify

Iterate only through reachable blocks. This finetunes r330706 and
it resolves build issue reported by Craig Topper.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331628 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed