[IDE] Consume identifier and ')' after parenthesized modifier

This fixes an issue where valid parenthesized modifiers like nonisolated(unsafe) get misinterpreted as function calls.

Author: a7medev

lib/Parse/ParseDecl.cpp

@@ -5718,8 +5718,8 @@ consumeIfParenthesizedModifier(Parser &P, StringRef name,
       std::find(allowedArguments.begin(), allowedArguments.end(),
                 P.Tok.getText()) != allowedArguments.end();
 
-  if (argumentIsAllowed && P.Tok.is(tok::identifier) &&
-      P.peekToken().is(tok::r_paren)) {
+  if (argumentIsAllowed && P.consumeIf(tok::identifier) &&
+      P.consumeIf(tok::r_paren)) {
     backtrack.cancelBacktrack();
     return true;
   }