Don't emit .seh_handler directives for any cleanup funclets
We were falsely claiming that we had an LSDA for the relevant EH
personality before this change, which could lead to the EH machinery
interpreting random adjacent data as an LSDA.
Fixes PR31317
This change is safe because cleanups can't contain exception handlers
today. We do these things to maintain that invariant:
- C++ destructors are naturally out-of-line
- __finally blocks are outlined in clang
- LLVM's inliner will not inline EH constructs into cleanups
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289101
91177308-0d34-0410-b5e6-
96231b3b80d8
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