[lld] Remove unused local variables (NFC) (#138470)

lld/COFF/DebugTypes.cpp

@@ -475,7 +475,6 @@ static bool equalsPath(StringRef path1, StringRef path2) {
 
 // Find by name an OBJ provided on the command line
 PrecompSource *UsePrecompSource::findObjByName(StringRef fileNameOnly) {
-  SmallString<128> currentPath;
   for (auto kv : ctx.precompSourceMappings) {
     StringRef currentFileName = sys::path::filename(kv.second->file->getName(),
                                                     sys::path::Style::windows);

lld/ELF/Driver.cpp

@@ -2319,8 +2319,7 @@ static void writeArchiveStats(Ctx &ctx) {
 
   os << "members\textracted\tarchive\n";
 
-  SmallVector<StringRef, 0> archives;
-  DenseMap<CachedHashStringRef, unsigned> all, extracted;
+  DenseMap<CachedHashStringRef, unsigned> extracted;
   for (ELFFileBase *file : ctx.objectFiles)
     if (file->archiveName.size())
       ++extracted[CachedHashStringRef(file->archiveName)];

lld/wasm/WriterUtils.cpp

@@ -75,7 +75,6 @@ static std::string toString(const llvm::wasm::WasmLimits &limits) {
 }
 
 std::string toString(const WasmTableType &type) {
-  SmallString<128> ret("");
   return "type=" + toString(static_cast<ValType>(type.ElemType)) +
          "; limits=[" + toString(type.Limits) + "]";
 }