[clang-tools-extra] Don't flush llvm::raw_string_ostream (NFC)

Don't call raw_string_ostream::flush(), which is essentially a no-op.
As specified in the docs, raw_string_ostream is always unbuffered.
( 65b13610a5226b84889b923bae884ba395ad084d for further reference )

clang-tools-extra/clang-tidy/bugprone/ForwardDeclarationNamespaceCheck.cpp

@@ -107,7 +107,6 @@ static std::string getNameOfNamespace(const CXXRecordDecl *Decl) {
   std::string Ns;
   llvm::raw_string_ostream OStream(Ns);
   NsDecl->printQualifiedName(OStream);
-  OStream.flush();
   return Ns.empty() ? "(global)" : Ns;
 }
 

clang-tools-extra/clangd/AST.cpp

@@ -187,7 +187,6 @@ std::string printQualifiedName(const NamedDecl &ND) {
   // In clangd, context is usually available and paths are mostly noise.
   Policy.AnonymousTagLocations = false;
   ND.printQualifiedName(OS, Policy);
-  OS.flush();
   assert(!StringRef(QName).starts_with("::"));
   return QName;
 }
@@ -270,7 +269,6 @@ std::string printTemplateSpecializationArgs(const NamedDecl &ND) {
     // location information.
     printTemplateArgumentList(OS, Cls->getTemplateArgs().asArray(), Policy);
   }
-  OS.flush();
   return TemplateArgs;
 }
 
@@ -303,7 +301,6 @@ std::string printObjCMethod(const ObjCMethodDecl &Method) {
     OS << ", ...";
 
   OS << ']';
-  OS.flush();
   return Name;
 }
 
@@ -314,7 +311,6 @@ std::string printObjCContainer(const ObjCContainerDecl &C) {
     const ObjCInterfaceDecl *Class = Category->getClassInterface();
     OS << getNameOrErrForObjCInterface(Class) << '(' << Category->getName()
        << ')';
-    OS.flush();
     return Name;
   }
   if (const ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(&C)) {
@@ -322,7 +318,6 @@ std::string printObjCContainer(const ObjCContainerDecl &C) {
     llvm::raw_string_ostream OS(Name);
     const ObjCInterfaceDecl *Class = CID->getClassInterface();
     OS << getNameOrErrForObjCInterface(Class) << '(' << CID->getName() << ')';
-    OS.flush();
     return Name;
   }
   return C.getNameAsString();

clang-tools-extra/clangd/Diagnostics.cpp

@@ -319,7 +319,6 @@ std::string mainMessage(const Diag &D, const ClangdDiagnosticOptions &Opts) {
       OS << "\n\n";
       printDiag(OS, Note);
     }
-  OS.flush();
   return capitalize(std::move(Result));
 }
 
@@ -335,7 +334,6 @@ std::string noteMessage(const Diag &Main, const DiagBase &Note,
     OS << "\n\n";
     printDiag(OS, Main);
   }
-  OS.flush();
   return capitalize(std::move(Result));
 }
 

clang-tools-extra/clangd/FindSymbols.cpp

@@ -182,7 +182,6 @@ std::string getSymbolName(ASTContext &Ctx, const NamedDecl &ND) {
     OS << (Method->isInstanceMethod() ? '-' : '+');
     Method->getSelector().print(OS);
 
-    OS.flush();
     return Name;
   }
   return printName(Ctx, ND);

clang-tools-extra/clangd/Hover.cpp

@@ -150,7 +150,6 @@ std::string printDefinition(const Decl *D, PrintingPolicy PP,
   std::string Definition;
   llvm::raw_string_ostream OS(Definition);
   D->print(OS, PP);
-  OS.flush();
   return Definition;
 }
 
@@ -179,7 +178,6 @@ HoverInfo::PrintedType printType(QualType QT, ASTContext &ASTCtx,
       OS << TT->getDecl()->getKindName() << " ";
   }
   QT.print(OS, PP);
-  OS.flush();
 
   const Config &Cfg = Config::current();
   if (!QT.isNull() && Cfg.Hover.ShowAKA) {
@@ -229,7 +227,6 @@ HoverInfo::PrintedType printType(const TemplateTemplateParmDecl *TTP,
   // FIXME: TemplateTemplateParameter doesn't store the info on whether this
   // param was a "typename" or "class".
   OS << "> class";
-  OS.flush();
   return Result;
 }
 
@@ -821,7 +818,6 @@ std::string typeAsDefinition(const HoverInfo::PrintedType &PType) {
   OS << PType.Type;
   if (PType.AKA)
     OS << " // aka: " << *PType.AKA;
-  OS.flush();
   return Result;
 }
 

clang-tools-extra/clangd/Preamble.cpp

@@ -913,7 +913,6 @@ PreamblePatch PreamblePatch::create(llvm::StringRef FileName,
   PP.PatchedMarks = std::move(ModifiedScan->Marks);
   PP.PatchedMacros = std::move(ModifiedScan->Macros);
   dlog("Created preamble patch: {0}", Patch.str());
-  Patch.flush();
   return PP;
 }
 

clang-tools-extra/clangd/Quality.cpp

@@ -554,7 +554,6 @@ std::string sortText(float Score, llvm::StringRef Name) {
   llvm::write_hex(OS, encodeFloat(-Score), llvm::HexPrintStyle::Lower,
                   /*Width=*/2 * sizeof(Score));
   OS << Name;
-  OS.flush();
   return S;
 }
 

clang-tools-extra/clangd/SystemIncludeExtractor.cpp

@@ -483,7 +483,6 @@ std::string convertGlobToRegex(llvm::StringRef Glob) {
     }
   }
   RegStream << '$';
-  RegStream.flush();
   return RegText;
 }
 

clang-tools-extra/clangd/index/StdLib.cpp

@@ -87,7 +87,6 @@ std::string buildUmbrella(llvm::StringLiteral Mandatory,
                         "#endif\n",
                         Header);
   }
-  OS.flush();
   return Result;
 }
 

clang-tools-extra/clangd/unittests/TypeHierarchyTests.cpp

@@ -242,7 +242,6 @@ const NamedDecl &findDeclWithTemplateArgs(ParsedAST &AST,
     // Use getNameForDiagnostic() which includes the template
     // arguments in the printed name.
     ND.getNameForDiagnostic(OS, Policy, /*Qualified=*/true);
-    OS.flush();
     return QName == Query;
   });
 }

clang-tools-extra/include-cleaner/unittests/RecordTest.cpp

@@ -546,7 +546,6 @@ TEST_F(PragmaIncludeTest, IWYUExportBlock) {
     for (auto &FE : FEs) {
       OS << FE.getName() << " ";
     }
-    OS.flush();
     return Result;
   };
   auto Exporters = PI.getExporters(FM.getFile("private1.h").get(), FM);

clang-tools-extra/modularize/Modularize.cpp

@@ -621,7 +621,6 @@ public:
     std::string Name;
     llvm::raw_string_ostream OS(Name);
     ND->printQualifiedName(OS);
-    OS.flush();
     if (Name.empty())
       return true;