Make declaration of wide_int_storage match its definition

[Gerald Pfeifer]

Farther below in wide-int.h, we define wide_int_storage as a class:

  class GTY(()) wide_int_storage
  {
  private:
    HOST_WIDE_INT val[WIDE_INT_MAX_ELTS];
    unsigned int len;
    unsigned int precision;
  :

The patch below, which I applied as obvious after a full bootstrap on
i386-unknown-freebsd10.0, makes the declaration match the definition.

Gerald

2014-07-05  Gerald Pfeifer  <gerald@pfeifer.com>

	* wide-int.h (wide_int_storage): Change declaration from struct 
	to class.

Index: wide-int.h
===================================================================
--- wide-int.h	(revision 212304)
+++ wide-int.h	(working copy)
@@ -284,7 +284,7 @@
 
 template <typename T> struct generic_wide_int;
 template <int N> struct fixed_wide_int_storage;
-struct wide_int_storage;
+class wide_int_storage;
 
 /* An N-bit integer.  Until we can use typedef templates, use this instead.  */
 #define FIXED_WIDE_INT(N) \