vm.c (thread_alloc): remove needless volatile

If we needed a volatile there, every other alloc function would need it.
There is nothing special I can see about thread_alloc which would
justify it.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47565 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Sat Sep 13 06:31:23 2014  Eric Wong  <e@80x24.org>
+
+	* vm.c (thread_alloc): remove needless volatile
+
 Sat Sep 13 06:13:55 2014  Eric Wong  <e@80x24.org>
 
 	* proc.c (proc_free): remove, use RUBY_TYPED_DEFAULT_FREE

vm.c

@@ -2121,7 +2121,7 @@ rb_obj_is_thread(VALUE obj)
 static VALUE
 thread_alloc(VALUE klass)
 {
-    VALUE volatile obj;
+    VALUE obj;
     rb_thread_t *th;
     obj = TypedData_Make_Struct(klass, rb_thread_t, &thread_data_type, th);