[MC] Don't pass MCSubtargetInfo down to shouldForceRelocation and evaluateTargetFixup (#141311) This reverts the code change in commit e87f33d9ce785668223c3bcc4e06956985cccda1 (#73721) but keeps its test. There have been many changes to lib/MC and AsmBackend.cpp files, so this is not a pure revert. #73721, a workaround to generate necessary relocations in mixed non-relax/relax code, is no longer necessary after #140692 fixed the root issue (whether two locations are separated by a fragment with indeterminate size due to linker relaxation).
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