merge revision(s) 40759,40966,41305,41306: [Backport #8436]

	vm_eval.c: suppress warning

	* vm_eval.c (eval_string_with_cref): narrow a variable scope into the
  EXEC_TAG block to suppress -Wclobberd warning.
	* vm_eval.c (eval_string_with_cref): propagate absolute path from the
	  binding if it is given explicitly.  patch by Gat (Dawid Janczak) at
	  [ruby-core:55123]. [Bug #8436]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@41317 b2dd03c8-39d4-4d8f-98ff-823fe69b080e