Add GTY support for irange.

Right now we have GTY support for static storage iranges
(int_range<>).  However, there's no reason why the base
class can't be used with GC, other than it was an oversight.

For that matter, the base class has a pointer to the sub-range
storage, so we can use the same implementation for both.  This
patch does so.

I have also removed the DEFINE_INT_RANGE_GC_STUBS
stuff, and have documented why we need a separate
gt_pch_nx (int_range<1> *&) version.  This has to do with
hash-traits.h, which ipa-prop.c is using to store a value_range.
The header file hash-traits.h is defining an extern of
gt_pch_nx (int_range<1> *&) etc, instead of calling the
more generic (int_range<1> *) which is already available.

It seems suspect that has-traits.h has their own externs
for GC functions, and if someone has a better solution, I'd
be glad to hear it.

gcc/ChangeLog:

	* value-range.cc (DEFINE_INT_RANGE_GC_STUBS): Remove.
	(gt_pch_nx (int_range<1> *&)): New.
	(gt_ggc_mx (int_range<1> *&)): New.
	* value-range.h (class irange): Add GTY support for
	the base class.

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