fix build with VM_CHECK_MODE > 0
This does not fix the test failure documented in [ruby-core:73371], that is for later.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53653 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
fix build with VM_CHECK_MODE > 0
[ruby-core:73371]
This does not fix the test failure documented in [ruby-core:73371],
that is for later.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53653 b2dd03c8-39d4-4d8f-98ff-823fe69b080e