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The relocation specifier should be accessed via MCValue::Specifier. However, some targets encode the relocation specifier within SymA using MCSymbolRefExpr::SubclassData and access it via getAccessVariant(), though this method is now deprecated. This change stores the SymA specifier at Specifier as well, unifying the two code paths. * CSKY: GOT- and PLT- relocations now suppress the STT_SECTION conversion. * AArch64: https://reviews.llvm.org/D156505 added `getRefkind` check to prevent folding. This is a hack and is now removed. MCValue: Unify relocation specifier storage by storing SymA specifier at Specifier The relocation specifier is accessed via MCValue::Specifier, but some targets encoded it within SymA using MCSymbolRefExpr::SubclassData and retrieved it through the now-deprecated getAccessVariant() method. This commit unifies the two approaches by storing the SymA specifier at `Specifier` as well. Additional changes: - CSKY: GOT- and PLT- relocations now suppress STT_SECTION conversion. - AArch64: Removed the `getRefkind` check hack (introduced in https://reviews.llvm.org/D156505) that prevented folding. Removed the assertion from `getRelocType`. - RISCV: Removed the assertion from `getRelocType`. Future plans: - Replace MCSymbolRefExpr members with MCSymbol within MCValue. - Remove `getSymSpecifier` (added for migration).