[wide-int] Reduce the size of the scratch arrays

[Richard Sandiford]

If yesterday's patch goes in, we'll only need the scratch array for
HWI inputs.  We can therefore shrink it to 2 HWIs.

Tested on x86_64-linux-gnu.  OK for wide-int?

Thanks,
Richard


Index: gcc/wide-int.h
===================================================================
--- gcc/wide-int.h      2013-10-19 20:08:15.571987579 +0100
+++ gcc/wide-int.h      2013-10-19 20:09:12.299436972 +0100
@@ -778,7 +778,7 @@ struct wide_int_ref_storage : public wi:
 private:
   /* Scratch space that can be used when decomposing the original integer.
      It must live as long as this object.  */
-  HOST_WIDE_INT scratch[WIDE_INT_MAX_ELTS];
+  HOST_WIDE_INT scratch[2];
 
 public:
   template <typename T>