[AliasAnalysis] CatchPad and CatchRet can modify escaped memory

CatchPad and CatchRet behave a lot like function calls: they can
potentially modify any memory which has been escaped.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@253323 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed