adjust wasm leb128 relaxation for new MCFragment API

Author: Lukasdoe

llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp

@@ -46,7 +46,7 @@ class WebAssemblyAsmBackend final : public MCAsmBackend {
   std::unique_ptr<MCObjectTargetWriter>
   createObjectTargetWriter() const override;
 
-  std::pair<bool, bool> relaxLEB128(MCLEBFragment &LF,
+  std::pair<bool, bool> relaxLEB128(MCFragment &LF,
                                     int64_t &Value) const override;
 
   bool writeNopData(raw_ostream &OS, uint64_t Count,
@@ -75,9 +75,9 @@ WebAssemblyAsmBackend::getFixupKindInfo(MCFixupKind Kind) const {
   return Infos[Kind - FirstTargetFixupKind];
 }
 
-std::pair<bool, bool> WebAssemblyAsmBackend::relaxLEB128(MCLEBFragment &LF,
+std::pair<bool, bool> WebAssemblyAsmBackend::relaxLEB128(MCFragment &LF,
                                                          int64_t &Value) const {
-  const MCExpr &Expr = LF.getValue();
+  const MCExpr &Expr = LF.getLEBValue();
   if (Expr.getKind() == MCExpr::ExprKind::SymbolRef) {
     const MCSymbolRefExpr &SymExpr = llvm::cast<MCSymbolRefExpr>(Expr);
     if (static_cast<WebAssembly::Specifier>(SymExpr.getSpecifier()) ==
@@ -88,8 +88,7 @@ std::pair<bool, bool> WebAssemblyAsmBackend::relaxLEB128(MCLEBFragment &LF,
   }
   // currently, this is only used for leb128 encoded function indices
   // that require relocations
-  LF.getFixups().push_back(
-      MCFixup::create(0, &Expr, WebAssembly::fixup_uleb128_i32, Expr.getLoc()));
+  LF.setVarFixups(MCFixup::create(0, &Expr, WebAssembly::fixup_uleb128_i32));
   // ensure that the stored placeholder is large enough to hold any 32-bit val
   Value = UINT32_MAX;
   return std::make_pair(true, false);