Revert of Ship ES2015 sloppy-mode function hoisting, let, class

test/webkit/fast/js/kde/func-decl-expected.txt

 # Copyright 2013 the V8 project authors. All rights reserved.
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-# Due to changes in ES2015 function hoisting semantics, this test is
-# no longer really accurate and is expected to fail. test262 and mjsunit
-# tests verify the correct semantics.
 KDE JS Test
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-FAIL Function declaration takes effect at entry: value has type undefined , not:function
+PASS Function declaration takes effect at entry
 PASS Decl not yet overwritten
 PASS After assign (0)
 PASS function decls have no execution content
 PASS After assign #2 (0)
-FAIL Decl already overwritten: value has type function , not:number
+PASS Decl already overwritten
 PASS After assign (1)
 PASS function decls have no execution content
 PASS After assign #2 (1)
-FAIL Decl already overwritten: value has type function , not:number
+PASS Decl already overwritten
 PASS After assign (2)
 PASS function decls have no execution content
 PASS After assign #2 (2)
 PASS successfullyParsed is true
 
 TEST COMPLETE