[WebAssembly] Add WebAssembly::Specifier

Move wasm-specific members outside of MCSymbolRefExpr::VariantKind (a
legacy interface I am eliminating). Most changes are mechanic and
similar to what I've done for many ELF targets (e.g. X86 #132149)

Notes:

* `fixSymbolsInTLSFixups` is replaced with `setTLS` in
  `WebAssemblyWasmObjectWriter::getRelocType`, similar to what I've done
  for many ELF targets.
* `SymA->setUsedInGOT()` in `recordRelocation` is moved to
  `getRelocType`.

While here, rename "Modifier' to "Specifier":

> "Relocation modifier", though concise, suggests adjustments happen during the linker's relocation step rather than the assembler's expression evaluation. I landed on "relocation specifier" as the winner. It's clear, aligns with Arm and IBM’s usage, and fits the assembler's role seamlessly.

Pull Request: https://github.com/llvm/llvm-project/pull/133116

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp b/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
index 7f35121..7ee6a3d8 100644
--- a/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
+++ b/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
@@ -14,6 +14,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "AsmParser/WebAssemblyAsmTypeCheck.h"
+#include "MCTargetDesc/WebAssemblyMCExpr.h"
 #include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
 #include "MCTargetDesc/WebAssemblyMCTypeUtilities.h"
 #include "MCTargetDesc/WebAssemblyTargetStreamer.h"
@@ -700,8 +701,8 @@ public:
       auto *WasmSym = cast<MCSymbolWasm>(Sym);
       WasmSym->setSignature(Signature);
       WasmSym->setType(wasm::WASM_SYMBOL_TYPE_FUNCTION);
-      const MCExpr *Expr = MCSymbolRefExpr::create(
-          WasmSym, MCSymbolRefExpr::VK_WASM_TYPEINDEX, Ctx);
+      const MCExpr *Expr =
+          MCSymbolRefExpr::create(WasmSym, WebAssembly::S_TYPEINDEX, Ctx);
       Operands.push_back(std::make_unique<WebAssemblyOperand>(
           Loc.getLoc(), Loc.getEndLoc(), WebAssemblyOperand::SymOp{Expr}));
     }