Ruby » Ruby master

merges r32347 from trunk into ruby_1_9_2.¶

• vm_insnhelper.c (vm_getivar): check vm state version
  to invalidate inline chache (ivar index).
  fixes Bug #4926.
• vm_insnhelper.c (vm_setivar): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@34429 b2dd03c8-39d4-4d8f-98ff-823fe69b080e