* include/ruby/ruby.h, vm_eval.c (rb_funcall_with_block):
  new function to invoke a method with a block passed
  as an argument.

* string.c (sym_call): use the above function to avoid
  a block sharing. [ruby-dev:47438] [Bug #8531]

* vm_insnhelper.c (vm_yield_with_cfunc): don't set block
  in the frame.

* test/ruby/test_symbol.rb (TestSymbol#test_block_given_to_proc):
  run related tests.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41360 b2dd03c8-39d4-4d8f-98ff-823fe69b080e