Remove unneeded variable references.

Former-commit-id: ab2f5f4408db25dc63b5d85b4adf156f9f978711

build/pre-compile.js

@@ -8,33 +8,24 @@
   /** Used to minify variables embedded in compiled strings */
   var compiledVars = [
     'accumulator',
-    'args',
-    'array',
     'arrayClass',
     'bind',
     'callback',
     'className',
     'collection',
-    'concat',
     'ctor',
     'false',
     'funcClass',
     'hasOwnProperty',
     'identity',
     'index',
-    'indexOf',
-    'isArray',
-    'isEmpty',
-    'isFunc',
     'length',
     'object',
     'objectTypes',
     'noaccum',
-    'prop',
     'property',
     'result',
     'skipProto',
-    'slice',
     'source',
     'sourceIndex',
     'stringClass',
@@ -177,7 +168,6 @@
     'throttle',
     'times',
     'toArray',
-    'toArray',
     'union',
     'uniq',
     'unique',