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merges r29155 from trunk into ruby_1_9_2. fixes #3777, #3772 and #3722.¶

• thread.c (ruby_suppress_tracing): restore the state and invoke
  the func with normal state. a patch from Satoshi Shiba at [ruby-dev:42162]. [ruby-core:31783]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@29574 b2dd03c8-39d4-4d8f-98ff-823fe69b080e