Ruby » Ruby master

vm.c: fix mark with rewinding cfp

• vm.c (m_core_hash_merge_ptr): copy the arguments to the machine
  stack before rewinding the control frame pointer and leaving the
  arguments outside valid region of the value stack.
  [ruby-core:69969] [Bug #11352]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51263 b2dd03c8-39d4-4d8f-98ff-823fe69b080e