Fix PR7180.

For

void f( a:🅱️:c );

we would cache the tokens "a:🅱️:" but then we would try to annotate them using the range "a::".
Before annotating them with the (invalid) C++ scope spec, set it to the range of "a:🅱️:".

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@106536 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Parse/ParseExprCXX.cpp

@@ -278,12 +278,10 @@ bool Parser::ParseOptionalCXXScopeSpecifier(CXXScopeSpec &SS,
         HasScopeSpecifier = true;
       }
 
-      if (SS.isInvalid())
-        continue;
-
-      SS.setScopeRep(
-        Actions.ActOnCXXNestedNameSpecifier(CurScope, SS, IdLoc, CCLoc, II,
-                                            ObjectType, EnteringContext));
+      if (!SS.isInvalid())
+        SS.setScopeRep(
+            Actions.ActOnCXXNestedNameSpecifier(CurScope, SS, IdLoc, CCLoc, II,
+                                                ObjectType, EnteringContext));
       SS.setEndLoc(CCLoc);
       continue;
     }

test/Parser/cxx-undeclared-identifier.cpp

@@ -1,5 +1,8 @@
 // RUN: %clang_cc1 -fsyntax-only -pedantic -verify %s
 
+// PR7180
+int f(a::b::c); // expected-error {{use of undeclared identifier 'a'}}
+
 class Foo::Bar { // expected-error {{use of undeclared identifier 'Foo'}} \
                  // expected-note {{to match this '{'}} \
                  // expected-error {{expected ';' after class}}