Fix typo, targetFeature should be lowercase.

this fixing also enable llc -mattr=+cpuhelp

Reviewers: ziangwan, kongyi

Reviewed By: kongyi

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D76757

Author: zakk0610

clang/tools/driver/cc1_main.cpp

@@ -177,7 +177,7 @@ static int PrintSupportedCPUs(std::string TargetStr) {
   // the target machine will handle the mcpu printing
   llvm::TargetOptions Options;
   std::unique_ptr<llvm::TargetMachine> TheTargetMachine(
-      TheTarget->createTargetMachine(TargetStr, "", "+cpuHelp", Options, None));
+      TheTarget->createTargetMachine(TargetStr, "", "+cpuhelp", Options, None));
   return 0;
 }
 

llvm/lib/MC/MCSubtargetInfo.cpp

@@ -185,7 +185,7 @@ static FeatureBitset getFeatures(StringRef CPU, StringRef FS,
     // Check for help
     if (Feature == "+help")
       Help(ProcDesc, ProcFeatures);
-    else if (Feature == "+cpuHelp")
+    else if (Feature == "+cpuhelp")
       cpuHelp(ProcDesc);
     else
       ApplyFeatureFlag(Bits, Feature, ProcFeatures);