[clang][Parse] use consistent Scope::ScopeFlags enum values [NFC]

Commit 438863a changed the underlying type of the Scope::ScopeFlags from
int to unsigned. This triggers type mismatch warnings from specific
compilers when the enum's values are combined in operations with integer
literal 0. Regardless of these warnings, similar code in other places
uses Scope::NoScope instead of literal 0. For consistency and to avoid
these warnings, we change the uses of literal 0 to Scope::NoScope.

Author: brunodf-snps

clang/lib/Parse/ParseDecl.cpp

@@ -6813,10 +6813,10 @@ void Parser::ParseDirectDeclarator(Declarator &D) {
       bool IsFunctionDeclaration = D.isFunctionDeclaratorAFunctionDeclaration();
       // Enter function-declaration scope, limiting any declarators to the
       // function prototype scope, including parameter declarators.
-      ParseScope PrototypeScope(this,
-                                Scope::FunctionPrototypeScope|Scope::DeclScope|
-                                (IsFunctionDeclaration
-                                   ? Scope::FunctionDeclarationScope : 0));
+      ParseScope PrototypeScope(
+          this, Scope::FunctionPrototypeScope | Scope::DeclScope |
+                    (IsFunctionDeclaration ? Scope::FunctionDeclarationScope
+                                           : Scope::NoScope));
 
       // The paren may be part of a C++ direct initializer, eg. "int x(1);".
       // In such a case, check if we actually have a function declarator; if it
@@ -7097,8 +7097,9 @@ void Parser::ParseParenDeclarator(Declarator &D) {
   // function prototype scope, including parameter declarators.
   ParseScope PrototypeScope(this,
                             Scope::FunctionPrototypeScope | Scope::DeclScope |
-                            (D.isFunctionDeclaratorAFunctionDeclaration()
-                               ? Scope::FunctionDeclarationScope : 0));
+                                (D.isFunctionDeclaratorAFunctionDeclaration()
+                                     ? Scope::FunctionDeclarationScope
+                                     : Scope::NoScope));
   ParseFunctionDeclarator(D, attrs, T, false, RequiresArg);
   PrototypeScope.Exit();
 }

clang/lib/Parse/ParseObjc.cpp

@@ -3295,9 +3295,9 @@ void Parser::ParseLexedObjCMethodDefs(LexedMethod &LM, bool parseMethod) {
   assert(Tok.isOneOf(tok::l_brace, tok::kw_try, tok::colon) &&
          "Inline objective-c method not starting with '{' or 'try' or ':'");
   // Enter a scope for the method or c-function body.
-  ParseScope BodyScope(this, (parseMethod ? Scope::ObjCMethodScope : 0) |
-                                 Scope::FnScope | Scope::DeclScope |
-                                 Scope::CompoundStmtScope);
+  ParseScope BodyScope(
+      this, (parseMethod ? Scope::ObjCMethodScope : Scope::NoScope) |
+                Scope::FnScope | Scope::DeclScope | Scope::CompoundStmtScope);
   Sema::FPFeaturesStateRAII SaveFPFeatures(Actions);
 
   // Tell the actions module that we have entered a method or c-function definition

clang/lib/Parse/ParseStmt.cpp

@@ -2529,9 +2529,9 @@ StmtResult Parser::ParseCXXTryBlockCommon(SourceLocation TryLoc, bool FnTry) {
     return StmtError(Diag(Tok, diag::err_expected) << tok::l_brace);
 
   StmtResult TryBlock(ParseCompoundStatement(
-      /*isStmtExpr=*/false, Scope::DeclScope | Scope::TryScope |
-                                Scope::CompoundStmtScope |
-                                (FnTry ? Scope::FnTryCatchScope : 0)));
+      /*isStmtExpr=*/false,
+      Scope::DeclScope | Scope::TryScope | Scope::CompoundStmtScope |
+          (FnTry ? Scope::FnTryCatchScope : Scope::NoScope)));
   if (TryBlock.isInvalid())
     return TryBlock;
 
@@ -2593,9 +2593,9 @@ StmtResult Parser::ParseCXXCatchBlock(bool FnCatch) {
   // C++ 3.3.2p3:
   // The name in a catch exception-declaration is local to the handler and
   // shall not be redeclared in the outermost block of the handler.
-  ParseScope CatchScope(this, Scope::DeclScope | Scope::ControlScope |
-                                  Scope::CatchScope |
-                                  (FnCatch ? Scope::FnTryCatchScope : 0));
+  ParseScope CatchScope(
+      this, Scope::DeclScope | Scope::ControlScope | Scope::CatchScope |
+                (FnCatch ? Scope::FnTryCatchScope : Scope::NoScope));
 
   // exception-declaration is equivalent to '...' or a parameter-declaration
   // without default arguments.