[generators] Fix loading of FormalParameterCount on 64bit archs.

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 512 matching lines @@
   'packed-elements': [SKIP],
   'regexp-global': [SKIP],
   'compiler/alloc-numbers': [SKIP],
   'math-floor-of-div': [PASS, TIMEOUT],
   'math-floor-of-div-nosudiv': [PASS, TIMEOUT],
   'unicodelctest': [PASS, TIMEOUT],
   'unicodelctest-no-optimization': [PASS, TIMEOUT],
   # Issue 3219:
   'getters-on-elements': [PASS, ['gc_stress == True', FAIL]],
 
-  # BUG(v8:4907)
-  'harmony/generators-turbo': [SKIP],
-
   # Ignition.
   'es6/templates': [PASS, ['no_snap and mode == debug', NO_IGNITION]],
-  'harmony/generators': [PASS, ['no_snap and mode == debug', NO_IGNITION]],
   'regress/regress-crbug-364374': [PASS, ['no_snap and mode == debug', NO_IGNITION]],
 }],  # 'arch == arm64 and mode == debug and simulator_run == True'
 
 ##############################################################################
 ['asan == True', {
   # Skip tests not suitable for ASAN.
   'big-array-literal': [SKIP],
   'big-object-literal': [SKIP],
   'regress/regress-crbug-178790': [SKIP],
 
@@ skipping 345 matching lines @@
 ##############################################################################
 ['gcov_coverage', {
   # Tests taking too long.
   'array-functions-prototype-misc': [SKIP],
 
   # Stack overflow.
   'big-array-literal': [SKIP],
 }],  # 'gcov_coverage'
 
 ]