[llvm] Use SmallString::str (NFC) (#92712)

Author: kazutakahirata

llvm/lib/Bitcode/Reader/BitcodeReader.cpp

@@ -2940,7 +2940,7 @@ Error BitcodeReader::parseValueSymbolTable(uint64_t Offset) {
       if (!BB)
         return error("Invalid bbentry record");
 
-      BB->setName(StringRef(ValueName.data(), ValueName.size()));
+      BB->setName(ValueName.str());
       ValueName.clear();
       break;
     }

llvm/lib/CodeGen/ParallelCG.cpp

@@ -79,9 +79,7 @@ void llvm::splitCodeGen(
               [TMFactory, FileType, ThreadOS](const SmallString<0> &BC) {
                 LLVMContext Ctx;
                 Expected<std::unique_ptr<Module>> MOrErr = parseBitcodeFile(
-                    MemoryBufferRef(StringRef(BC.data(), BC.size()),
-                                    "<split-module>"),
-                    Ctx);
+                    MemoryBufferRef(BC.str(), "<split-module>"), Ctx);
                 if (!MOrErr)
                   report_fatal_error("Failed to read bitcode");
                 std::unique_ptr<Module> MPartInCtx = std::move(MOrErr.get());

llvm/lib/LTO/LTOBackend.cpp

@@ -452,9 +452,8 @@ static void splitCodeGen(const Config &C, TargetMachine *TM,
         CodegenThreadPool.async(
             [&](const SmallString<0> &BC, unsigned ThreadId) {
               LTOLLVMContext Ctx(C);
-              Expected<std::unique_ptr<Module>> MOrErr = parseBitcodeFile(
-                  MemoryBufferRef(StringRef(BC.data(), BC.size()), "ld-temp.o"),
-                  Ctx);
+              Expected<std::unique_ptr<Module>> MOrErr =
+                  parseBitcodeFile(MemoryBufferRef(BC.str(), "ld-temp.o"), Ctx);
               if (!MOrErr)
                 report_fatal_error("Failed to read bitcode");
               std::unique_ptr<Module> MPartInCtx = std::move(MOrErr.get());