Fixes asserting with windows-elf triples. Should fix regression
reported in https://github.com/llvm/llvm-project/pull/147225#issuecomment-3054190938
I'm not sure this is a valid triple, but I'm guessing the MCJIT usage
is an accident. This does change the behavior from trying to use WinEH
to DwarfCFI; however the backend crashes with WinEH so I'm assuming following
ELF is the more correct option.
617af3cc50