[llvm] Use StringRef::contains (NFC) (#165397)

Identified with readability-container-contains

Author: kazutakahirata

llvm/include/llvm/IR/Mangler.h

@@ -80,8 +80,7 @@ getArm64ECDemangledFunctionName(StringRef Name);
 
 /// Check if an ARM64EC function name is mangled.
 bool inline isArm64ECMangledFunctionName(StringRef Name) {
-  return Name[0] == '#' ||
-         (Name[0] == '?' && Name.find("@$$h") != StringRef::npos);
+  return Name[0] == '#' || (Name[0] == '?' && Name.contains("@$$h"));
 }
 
 } // End llvm namespace

llvm/lib/Target/NVPTX/NVPTXTargetTransformInfo.cpp

@@ -493,7 +493,7 @@ NVPTXTTIImpl::getInstructionCost(const User *U,
             // predicate ("@").
             return !AsmInst.empty() &&
                    (AsmInst[0] == '@' || isAlpha(AsmInst[0]) ||
-                    AsmInst.find(".pragma") != StringRef::npos);
+                    AsmInst.contains(".pragma"));
           });
       return InstCount * TargetTransformInfo::TCC_Basic;
     }

llvm/lib/Target/SystemZ/SystemZISelLowering.cpp

@@ -8973,8 +8973,7 @@ SystemZTargetLowering::getJumpConditionMergingParams(Instruction::BinaryOps Opc,
         if (const auto *CB = dyn_cast<CallBase>(RHSVal)) {
           if (CB->isInlineAsm()) {
             const InlineAsm *IA = cast<InlineAsm>(CB->getCalledOperand());
-            return IA &&
-                   IA->getConstraintString().find("{@cc}") != std::string::npos;
+            return IA && IA->getConstraintString().contains("{@cc}");
           }
         }
       }