[CodeExtractor] Prevent extraction of block involving blockaddress

BlockAddress are only valid within their function context, which does not
interact well with CodeExtractor. Detect this case and prevent it.

Differential Revision: https://reviews.llvm.org/D33839


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306448 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed