[lld] [lld] Add infrastructure for handling RISCV vendor-specific relocations. (PR #159987)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- lld/ELF/Arch/RISCV.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/lld/ELF/Arch/RISCV.cpp b/lld/ELF/Arch/RISCV.cpp
index fbc249820..5ed89e47c 100644
--- a/lld/ELF/Arch/RISCV.cpp
+++ b/lld/ELF/Arch/RISCV.cpp
@@ -1505,8 +1505,8 @@ void RISCV::scanSectionImpl(InputSectionBase &sec, Relocs<RelTy> rels) {
     } else if (!rvVendor.empty()) {
       Err(ctx) << getErrorLoc(ctx, loc)
                << "unknown vendor-specific relocation (" << type.v
-               << ") in namespace '" << rvVendor << "' against symbol '"
-               << &sym << "'";
+               << ") in namespace '" << rvVendor << "' against symbol '" << &sym
+               << "'";
       rvVendor = "";
       continue;
     }

``````````

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https://github.com/llvm/llvm-project/pull/159987