[PATCH 2/7] Do not query SCEV in range_of_phi unless dominators are available.

[Aldy Hernandez <aldyh@redhat.com>]

SCEV won't work without dominators and we can get called without
dominators from debug_ranger.

Another option would be to rename scev_initialized_p to something like
scev_available_p and move the check there.  For now, this will do.

Committed.

gcc/ChangeLog:

	* gimple-range-fold.cc (fold_using_range::range_of_phi): Check
	dom_info_available_p.
---
 gcc/gimple-range-fold.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gcc/gimple-range-fold.cc b/gcc/gimple-range-fold.cc
index 997d02dd4b9..4dbf4188ec2 100644
--- a/gcc/gimple-range-fold.cc
+++ b/gcc/gimple-range-fold.cc
@@ -781,7 +781,9 @@ fold_using_range::range_of_phi (irange &r, gphi *phi, fur_source &src)
     }
 
   // If SCEV is available, query if this PHI has any knonwn values.
-  if (scev_initialized_p () && !POINTER_TYPE_P (TREE_TYPE (phi_def)))
+  if (dom_info_available_p (CDI_DOMINATORS)
+      && scev_initialized_p ()
+      && !POINTER_TYPE_P (TREE_TYPE (phi_def)))
     {
       value_range loop_range;
       class loop *l = loop_containing_stmt (phi);
-- 
2.31.1