[clang] [llvm] [ARM] Add support for Windows SEH (PR #184953)

[Eli Friedman via cfe-commits]

https://github.com/efriedma-quic commented:

> For testing, would enabling existing tests for 32-bit ARM like https://github.com/llvm/llvm-project/commit/1f6fb8d06394961049e48f7f16ce81538e38b778 did for ARM64 be sufficient?

I'd like to see IR tests for the backend, along the lines of llvm/test/CodeGen/AArch64/wineh-try-catch*

https://github.com/llvm/llvm-project/pull/184953