[llvm] Use StringRef::contains (NFC) (#92710)

Author: kazutakahirata

llvm/lib/IR/Mangler.cpp

@@ -292,7 +292,7 @@ void llvm::emitLinkerFlagsForUsedCOFF(raw_ostream &OS, const GlobalValue *GV,
 
 std::optional<std::string> llvm::getArm64ECMangledFunctionName(StringRef Name) {
   bool IsCppFn = Name[0] == '?';
-  if (IsCppFn && Name.find("$$h") != std::string::npos)
+  if (IsCppFn && Name.contains("$$h"))
     return std::nullopt;
   if (!IsCppFn && Name[0] == '#')
     return std::nullopt;

llvm/lib/Target/SPIRV/SPIRVBuiltins.cpp

@@ -1886,7 +1886,7 @@ static bool buildEnqueueKernel(const SPIRV::IncomingCall *Call,
   // Local sizes arguments: Sizes of block invoke arguments. Clang generates
   // local size operands as an array, so we need to unpack them.
   SmallVector<Register, 16> LocalSizes;
-  if (Call->Builtin->Name.find("_varargs") != StringRef::npos || IsSpirvOp) {
+  if (Call->Builtin->Name.contains("_varargs") || IsSpirvOp) {
     const unsigned LocalSizeArrayIdx = HasEvents ? 9 : 6;
     Register GepReg = Call->Arguments[LocalSizeArrayIdx];
     MachineInstr *GepMI = MRI->getUniqueVRegDef(GepReg);

llvm/lib/TextAPI/Utils.cpp

@@ -184,7 +184,7 @@ llvm::Expected<Regex> llvm::MachO::createRegexFromGlob(StringRef Glob) {
       break;
     }
     default:
-      if (RegexMetachars.find(C) != StringRef::npos)
+      if (RegexMetachars.contains(C))
         RegexString.push_back('\\');
       RegexString.push_back(C);
     }