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

[Trung Nguyen via cfe-commits]

trungnt2910 wrote:

I made a `clang`-friendly build of their tests here:
https://github.com/trungnt2910/windows_seh_tests

The results were:
`x86_64`: Crash.
`i686`: Linker errors.
`aarch64`: Crash.
`armv7`, after this patch: Crash, similar to `aarch64`.

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