[COMMITTED] Implement some miscellaneous zero accessors for Value_Range.

[Aldy Hernandez via Gcc-patches]

This adds some missing accessors to the type agnostic Value_Range
class.  They'll be used in the upcoming IPA work.

gcc/ChangeLog:

        * value-range.h (class Value_Range): Implement set_zero,
        set_nonzero, and nonzero_p.
---
 gcc/value-range.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gcc/value-range.h b/gcc/value-range.h
index af81d6080da..171e6426c6e 100644
--- a/gcc/value-range.h
+++ b/gcc/value-range.h
@@ -542,6 +542,9 @@ public:
   bool contains_p (tree cst) const { return m_vrange->contains_p (cst); }
   bool singleton_p (tree *result = NULL) const
     { return m_vrange->singleton_p (result); }
+  void set_zero (tree type) { return m_vrange->set_zero (type); }
+  void set_nonzero (tree type) { return m_vrange->set_nonzero (type); }
+  bool nonzero_p () const { return m_vrange->nonzero_p (); }
   bool zero_p () const { return m_vrange->zero_p (); }
   wide_int lower_bound () const; // For irange/prange comparability.
   wide_int upper_bound () const; // For irange/prange comparability.
-- 
2.40.1