* vm_trace.c: prohibit to specify normal events and internal events
  simultaneously.
  I will introduce special care for internal events later.
* ext/-test-/tracepoint/tracepoint.c: test this behavior.
* test/-ext-/tracepoint/test_tracepoint.rb: ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43854 b2dd03c8-39d4-4d8f-98ff-823fe69b080e