* 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: renmae 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/trunk@45758 b2dd03c8-39d4-4d8f-98ff-823fe69b080e