reg2mem should ignore EH instructions

[Naville]

Godbolt

My attempted fix was to add CatchSwitchInst ignoring logic in reg2mem's valueEscapes, which worked for me in this case, but not sure if there are other cases missing

[Naville]

Submitted as D137700

[EugeneZelenko]

@Naville: Looks like https://reviews.llvm.org/D137700 is still in review stage.

[Naville]

@EugeneZelenko Thanks, I thought you close the issue once a patch is in review process

[Naville]

Accepted, closing this issue