[llvm] [RISCV] Vendor Relocations for Xqci extension (PR #135400)

[Fangrui Song via llvm-commits]

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@@ -660,7 +698,16 @@ bool RISCVAsmBackend::addReloc(const MCFragment &F, const MCFixup &Fixup,
   if (IsResolved &&
       (getFixupKindInfo(Fixup.getKind()).Flags & MCFixupKindInfo::FKF_IsPCRel))
     IsResolved = isPCRelFixupResolved(Target.getAddSym(), F);
-  IsResolved = MCAsmBackend::addReloc(F, Fixup, Target, FixedValue, IsResolved);
+
+  if (!IsResolved) {
+    // Some Fixups require a vendor relocation, record it (directly) before we
+    // add the relocation.
+    if (std::optional<StringRef> VendorIdentifier =
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MaskRay wrote:

Combine the two functions and just call sth like `maybeAddVendorReloc(F, Fixup)`

https://github.com/llvm/llvm-project/pull/135400