* vm_insnhelper.c (vm_invoke_block): returning from lambda proc
  now always exits from the Proc. [ruby-core:56193] [Feature #8693]

* NEWS, test/ruby/test_lambda.rb: ditto. Patch by nobu.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42455 b2dd03c8-39d4-4d8f-98ff-823fe69b080e