[flang] [clang] [lld] [compiler-rt] [libunwind] [mlir] [clang-tools-extra] [lldb] [llvm] [openmp] [BranchFolding] Fix missing predecessors of landing-pad (PR #77608)

[Vladimir Vereschaka via cfe-commits]

vvereschaka wrote:

@HaohaiWen ,
looks like these changes break some builders with the failed test
`UNRESOLVED: LLVM::windows-seh-EHa-PreserveCFG.s`

https://lab.llvm.org/buildbot/#/builders/234
https://lab.llvm.org/buildbot/#/builders/58
https://lab.llvm.org/buildbot/#/builders/104
https://lab.llvm.org/buildbot/#/builders/235

>Oh, sorry. I fixed it in https://github.com/llvm/llvm-project/pull/77784.
it didn't fix the problem.

https://github.com/llvm/llvm-project/pull/77608