merge revision(s) r45758,r45759: [Backport #9759]

	* vm.c (invoke_block_from_c): add VM_FRAME_FLAG_BMETHOD to record
	  it is bmethod frame.

	* vm.c (vm_exec): invoke RUBY_EVENT_RETURN event if rollbacked frame
	  is VM_FRAME_FLAG_BMETHOD.
	  [Bug #9759]

	* test/ruby/test_settracefunc.rb: add a test for TracePoint/set_trace_func.

	* vm_core.h: rename rb_thread_t::passed_me to
	  rb_thread_t::passed_bmethod_me to clarify the usage.

	* vm_insnhelper.c (vm_call_bmethod_body): use renamed member.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@45928 b2dd03c8-39d4-4d8f-98ff-823fe69b080e