Don't allow invariant in a function.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@24009 e7fa87d3-cd2b-0410-9028-fcbf551c1848

glslang/MachineIndependent/glslang.y

@@ -1059,6 +1059,7 @@ fully_specified_type
 
 invariant_qualifier
     : INVARIANT {
+        parseContext.globalCheck($1.loc, "invariant");
         parseContext.profileRequires($$.loc, ENoProfile, 120, 0, "invariant");
         $$.init($1.loc);
         $$.qualifier.invariant = true;