refactor($parse): Create idents lazily

Create the ident functions lazily as these are not
used for filters not object literal properties

Closes #9131

Author: lgalfaso

src/ng/parse.js

@@ -318,7 +318,8 @@ Lexer.prototype = {
     this.tokens.push({
       index: start,
       text: ident,
-      fn: CONSTANTS[ident] || getterFn(ident, this.options, expression)
+      fn: CONSTANTS[ident],
+      lazyFn: CONSTANTS[ident] ? undefined : lazyGetterFn(ident, this.options, expression)
     });
 
     if (methodName) {
@@ -426,7 +427,7 @@ Parser.prototype = {
       primary = this.object();
     } else {
       var token = this.expect();
-      primary = token.fn;
+      primary = token.fn || token.lazyFn && token.lazyFn();
       if (!primary) {
         this.throwError('not a primary expression', token);
       }
@@ -945,6 +946,12 @@ function getterFn(path, options, fullExp) {
   return fn;
 }
 
+function lazyGetterFn(ident, options, expression) {
+  return function() {
+    return getterFn(ident, options, expression);
+  };
+}
+
 ///////////////////////////////////
 
 /**