[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, 0 insertions, 9 deletions

diff --git a/llvm/lib/MC/WasmObjectWriter.cpp b/llvm/lib/MC/WasmObjectWriter.cpp
index 302ba6e..18c85c6 100644
--- a/llvm/lib/MC/WasmObjectWriter.cpp
+++ b/llvm/lib/MC/WasmObjectWriter.cpp
@@ -606,15 +606,6 @@ void WasmObjectWriter::recordRelocation(MCAssembler &Asm,
     SymA->setUsedInReloc();
   }
 
-  switch (Target.getSpecifier()) {
-  case MCSymbolRefExpr::VK_GOT:
-  case MCSymbolRefExpr::VK_WASM_GOT_TLS:
-    SymA->setUsedInGOT();
-    break;
-  default:
-    break;
-  }
-
   WasmRelocationEntry Rec(FixupOffset, SymA, C, Type, &FixupSection);
   LLVM_DEBUG(dbgs() << "WasmReloc: " << Rec << "\n");