* vm_dump.c (rb_vmdebug_debug_print_pre): Bugfix. Get PC directly.
	  PC is cached into local stack and cfp->pc is incorrent at next of
	  branch or jump.
	* vm_exec.h (DEBUG_ENTER_INSN): catch up this change.
	* vm_core.h: update signature of rb_vmdebug_debug_print_pre.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43916 b2dd03c8-39d4-4d8f-98ff-823fe69b080e