C++: Rename resolve to resolveClass, and remove unused isElement

Author: ian-semmle

cpp/ql/src/semmle/code/cpp/Element.qll

@@ -10,7 +10,7 @@ private import semmle.code.cpp.internal.Type
  */
 private cached @element resolveElement(@element e) {
   if isClass(e)
-  then result = resolve(e)
+  then result = resolveClass(e)
   else result = e
 }
 

cpp/ql/src/semmle/code/cpp/internal/Type.qll

@@ -35,7 +35,7 @@ cached private module Cached {
    * multiple complete classes have the same name, this predicate may have
    * multiple results.
    */
-  cached @usertype resolve(@usertype c) {
+  cached @usertype resolveClass(@usertype c) {
     hasCompleteTwin(c, result)
     or
     (not hasCompleteTwin(c, _) and result = c)
@@ -48,8 +48,4 @@ cached private module Cached {
     (usertypes(t,_,1) or usertypes(t,_,2) or usertypes(t,_,3) or usertypes(t,_,6)
     or usertypes(t,_,10) or usertypes(t,_,11) or usertypes(t,_,12))
   }
-
-  cached predicate isElement(@element e) {
-    isClass(e) implies e = resolve(_)
-  }
 }