[BOLT][NFC] Refactor relocation arch selection #87829
Merged
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Having these routines default to x86_64 and just process reloc numbers as if they are for that arch is fragile when porting BOLT. This converts these routines to use switches with an explicitly marked unreachable default case.
I considered the alternative of having x86_64 being the default, with an assert on Arch there, but thought this way is clearer.