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

test/mjsunit/mjsunit.status

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 1063 matching lines @@
   'try-finally-continue': [SKIP],
   'try': [SKIP],
   'undetectable-compare': [SKIP],
   'unused-context-in-with': [SKIP],
   'value-wrapper': [SKIP],
   'with-function-expression': [SKIP],
   'with-parameter-access': [SKIP],
   'with-prototype': [SKIP],
   'with-readonly': [SKIP],
   'with-value': [SKIP],
-  'regress/regress-builtinbust-7': [SKIP],
-  'regress/regress-crbug-451770': [SKIP],
-  'regress/regress-crbug-503968': [SKIP],
-  'regress/regress-crbug-504729': [SKIP],
 }],  # ignition == True
 
 ['ignition == True and (arch == arm or arch == arm64)', {
   'array-sort': [SKIP],
   'array-store-and-grow': [SKIP],
   'date-parse': [SKIP],
   'math-floor-part1': [SKIP],
   'math-floor-part2': [SKIP],
   'math-floor-part3': [SKIP],
   'mul-exhaustive-part*': [SKIP],
@@ skipping 30 matching lines @@
 
 ##############################################################################
 ['gcov_coverage', {
   # Tests taking too long.
   'array-functions-prototype-misc': [SKIP],
   'strong/implicit-conversions': [SKIP],
   'strong/load-element-mutate-backing-store': [SKIP],
 }],  # 'gcov_coverage'
 
 ]