MCValue: Store SymA specifier at Specifier

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).
11 files changed
tree: 6d5b9674e6bfafe6e9c23d7e7b498144eaf542a1
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. flang-rt/
  11. libc/
  12. libclc/
  13. libcxx/
  14. libcxxabi/
  15. libunwind/
  16. lld/
  17. lldb/
  18. llvm/
  19. llvm-libgcc/
  20. mlir/
  21. offload/
  22. openmp/
  23. polly/
  24. pstl/
  25. runtimes/
  26. third-party/
  27. utils/
  28. .clang-format
  29. .clang-tidy
  30. .git-blame-ignore-revs
  31. .gitattributes
  32. .gitignore
  33. .mailmap
  34. CODE_OF_CONDUCT.md
  35. CONTRIBUTING.md
  36. LICENSE.TXT
  37. pyproject.toml
  38. README.md
  39. SECURITY.md
README.md

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