[PATCH] Fix pointer sharing in Value_Range constructor.

[Aldy Hernandez via Gcc-patches]

I will push this when a final round of testing finishes on x86-64 Linux.

gcc/ChangeLog:

        * value-range.h (Value_Range::Value_Range): Avoid pointer sharing.
---
 gcc/value-range.h | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/gcc/value-range.h b/gcc/value-range.h
index 0eeea79b322..f97596cdd14 100644
--- a/gcc/value-range.h
+++ b/gcc/value-range.h
@@ -583,7 +583,18 @@ Value_Range::Value_Range (tree min, tree max, 
value_range_kind kind)
 inline
 Value_Range::Value_Range (const Value_Range &r)
 {
-  m_vrange = r.m_vrange;
+  if (r.m_vrange == &r.m_irange)
+    {
+      m_irange = r.m_irange;
+      m_vrange = &m_irange;
+    }
+  else if (r.m_vrange == &r.m_frange)
+    {
+      m_frange = r.m_frange;
+      m_vrange = &m_frange;
+    }
+  else
+    m_vrange = &m_unsupported;
 }
 
 // Initialize object so it is possible to store temporaries of TYPE
-- 
2.39.2