Use StringRef::find_first_of(char), etc (NFC) (#92841)

Author: kazutakahirata

clang/utils/TableGen/ClangDiagnosticsEmitter.cpp

@@ -1086,7 +1086,7 @@ Piece *DiagnosticTextBuilder::DiagText::parseDiagText(StringRef &Text,
       PluralPiece *Plural = New<PluralPiece>();
       do {
         Text = Text.drop_front(); // '{' or '|'
-        size_t End = Text.find_first_of(":");
+        size_t End = Text.find_first_of(':');
         if (End == StringRef::npos)
           Builder.PrintFatalError("expected ':' while parsing %plural");
         ++End;

llvm/lib/Support/LockFileManager.cpp

@@ -66,7 +66,7 @@ LockFileManager::readLockFile(StringRef LockFileName) {
   StringRef Hostname;
   StringRef PIDStr;
   std::tie(Hostname, PIDStr) = getToken(MB.getBuffer(), " ");
-  PIDStr = PIDStr.substr(PIDStr.find_first_not_of(" "));
+  PIDStr = PIDStr.substr(PIDStr.find_first_not_of(' '));
   int PID;
   if (!PIDStr.getAsInteger(10, PID)) {
     auto Owner = std::make_pair(std::string(Hostname), PID);

llvm/tools/llvm-rtdyld/llvm-rtdyld.cpp

@@ -649,9 +649,9 @@ void applySpecificSectionMappings(RuntimeDyld &Dyld,
                                   const FileToSectionIDMap &FileToSecIDMap) {
 
   for (StringRef Mapping : SpecificSectionMappings) {
-    size_t EqualsIdx = Mapping.find_first_of("=");
+    size_t EqualsIdx = Mapping.find_first_of('=');
     std::string SectionIDStr = std::string(Mapping.substr(0, EqualsIdx));
-    size_t ComaIdx = Mapping.find_first_of(",");
+    size_t ComaIdx = Mapping.find_first_of(',');
 
     if (ComaIdx == StringRef::npos)
       report_fatal_error("Invalid section specification '" + Mapping +

mlir/lib/Tools/mlir-lsp-server/MLIRServer.cpp

@@ -917,7 +917,7 @@ void MLIRDocument::getCodeActionForDiagnostic(
   edit.range = lsp::Range(lsp::Position(pos.line, 0));
 
   // Use the indent of the current line for the expected-* diagnostic.
-  size_t indent = line.find_first_not_of(" ");
+  size_t indent = line.find_first_not_of(' ');
   if (indent == StringRef::npos)
     indent = line.size();