vm_eval.c (rb_yield_splat): add missing GC guard

Nobody uses this function in our source tree, but maybe this
bug is triggered by certain C extensions.

[Bug #10509]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48417 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Fri Nov 14 09:25:44 2014  Eric Wong  <e@80x24.org>
+
+	* vm_eval.c (rb_yield_splat): add missing GC guard
+	  [Bug #10509]
+
 Fri Nov 14 08:12:40 2014  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
 
 	* gc.c: fix build error caused by implicit conversion with clang.

vm_eval.c

@@ -989,6 +989,7 @@ rb_yield_splat(VALUE values)
         rb_raise(rb_eArgError, "not an array");
     }
     v = rb_yield_0(RARRAY_LENINT(tmp), RARRAY_CONST_PTR(tmp));
+    RB_GC_GUARD(tmp);
     return v;
 }