[Driver] Use != instead of compare to compare strings (NFC) (llvm#113651)

Author: kazutakahirata

clang/lib/Driver/ToolChains/Clang.cpp

@@ -2838,7 +2838,7 @@ static std::string ComplexArithmeticStr(LangOptions::ComplexRangeKind Range) {
 
 static void EmitComplexRangeDiag(const Driver &D, std::string str1,
                                  std::string str2) {
-  if ((str1.compare(str2) != 0) && !str2.empty() && !str1.empty()) {
+  if (str1 != str2 && !str2.empty() && !str1.empty()) {
     D.Diag(clang::diag::warn_drv_overriding_option) << str1 << str2;
   }
 }
@@ -2996,8 +2996,8 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
         EmitComplexRangeDiag(D, RenderComplexRangeOption(Range),
                              "-fno-cx-limited-range");
       } else {
-        if (GccRangeComplexOption.compare("-fcx-limited-range") != 0 &&
-            GccRangeComplexOption.compare("-fno-cx-fortran-rules") != 0)
+        if (GccRangeComplexOption != "-fcx-limited-range" &&
+            GccRangeComplexOption != "-fno-cx-fortran-rules")
           EmitComplexRangeDiag(D, GccRangeComplexOption,
                                "-fno-cx-limited-range");
       }
@@ -3042,8 +3042,8 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
         break;
       }
       if (!GccRangeComplexOption.empty()) {
-        if (GccRangeComplexOption.compare("-fcx-limited-range") != 0) {
-          if (GccRangeComplexOption.compare("-fcx-fortran-rules") != 0) {
+        if (GccRangeComplexOption != "-fcx-limited-range") {
+          if (GccRangeComplexOption != "-fcx-fortran-rules") {
             if (RangeVal != LangOptions::ComplexRangeKind::CX_Improved)
               EmitComplexRangeDiag(D, GccRangeComplexOption,
                                    ComplexArithmeticStr(RangeVal));