* class.c, compile.c, eval.c, gc.h, insns.def, internal.h, method.h,
  variable.c, vm.c, vm_core.c, vm_insnhelper.c, vm_insnhelper.h,
  vm_method.c: Implement class hierarchy method cache invalidation.

  [ruby-core:55053] [Feature #8426] [GH-387]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42822 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Conflicts:
	ChangeLog
	class.c
	eval.c
	internal.h
	variable.c
	vm_insnhelper.c
* vm_insnhelper.c (vm_search_method): no need to check klass == ci->klass
  in method cache guard - class sequence number has the same uniqueness
  guarantees

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42836 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* vm_insnhelper.c (vm_search_method): no need to check klass == ci->k…
lass

  in method cache guard - class sequence number has the same uniqueness
  guarantees

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42836 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* class.c (class_alloc): remove mc_tbl

* gc.c (obj_free): ditto

* internal.h (struct rb_classext_struct): ditto

* method.h (rb_method_entry): remove ent param

* vm_method.c: restore the global method cache. Per class cache tables
  turned out to be far too slow.

  [ruby-core:57289] [Bug #8930]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43027 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Conflicts:
	ChangeLog
* gc.c (free_method_cache_entry_i): unused function

* gc.c (rb_free_mc_table): ditto

* internal.h (method_cache_entry_t): unused struct

* vm_method.c (verify_method_cache): remove unused variable

* vm_method.c (rb_method_entry): ditto

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43028 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Conflicts:
	ChangeLog
merge conflict fail