[llvm] Remove unused local variables (NFC) (llvm#140422)

Author: kazutakahirata

llvm/lib/Object/Object.cpp

@@ -182,7 +182,6 @@ LLVMObjectFileRef LLVMCreateObjectFile(LLVMMemoryBufferRef MemBuf) {
   std::unique_ptr<MemoryBuffer> Buf(unwrap(MemBuf));
   Expected<std::unique_ptr<ObjectFile>> ObjOrErr(
       ObjectFile::createObjectFile(Buf->getMemBufferRef()));
-  std::unique_ptr<ObjectFile> Obj;
   if (!ObjOrErr) {
     // TODO: Actually report errors helpfully.
     consumeError(ObjOrErr.takeError());

llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp

@@ -2871,7 +2871,6 @@ SDValue WebAssemblyTargetLowering::LowerShift(SDValue Op,
 
 SDValue WebAssemblyTargetLowering::LowerFP_TO_INT_SAT(SDValue Op,
                                                       SelectionDAG &DAG) const {
-  SDLoc DL(Op);
   EVT ResT = Op.getValueType();
   EVT SatVT = cast<VTSDNode>(Op.getOperand(1))->getVT();
 

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -53260,7 +53260,6 @@ static SDValue combineMaskedStore(SDNode *N, SelectionDAG &DAG,
     return SDValue();
 
   EVT VT = Mst->getValue().getValueType();
-  SDLoc dl(Mst);
   const TargetLowering &TLI = DAG.getTargetLoweringInfo();
 
   if (Mst->isTruncatingStore())

llvm/tools/llvm-mca/llvm-mca.cpp

@@ -454,8 +454,6 @@ int main(int argc, char **argv) {
   // Tell SrcMgr about this buffer, which is what the parser will pick up.
   SrcMgr.AddNewSourceBuffer(std::move(*BufferPtr), SMLoc());
 
-  std::unique_ptr<buffer_ostream> BOS;
-
   std::unique_ptr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
   assert(MCII && "Unable to create instruction info!");
 

llvm/tools/llvm-rc/ResourceFileWriter.cpp

@@ -1573,7 +1573,6 @@ Expected<std::unique_ptr<MemoryBuffer>>
 ResourceFileWriter::loadFile(StringRef File) const {
   SmallString<128> Path;
   SmallString<128> Cwd;
-  std::unique_ptr<MemoryBuffer> Result;
 
   // 0. The file path is absolute or has a root directory, so we shouldn't
   // try to append it on top of other base directories. (An absolute path