[PATCH 03/41] sbitmap.h: add operator const_sbitmap to auto_sbitmap

[David Malcolm]

Needs review.  (Used in one place by region-model.cc)

Changed in v5:
- follow msebor's suggestion of using operator const_sbitmap
rather than operator const sbitmap&, as per:
https://gcc.gnu.org/ml/gcc-patches/2019-12/msg00224.html

gcc/ChangeLog:
        * sbitmap.h (auto_sbitmap): Add operator const_sbitmap.
---
 gcc/sbitmap.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/sbitmap.h b/gcc/sbitmap.h
index e3f514f0ebf1..9c4215db29b0 100644
--- a/gcc/sbitmap.h
+++ b/gcc/sbitmap.h
@@ -295,6 +295,7 @@ public:
 
   /* Allow calling sbitmap functions on our bitmap.  */
   operator sbitmap () { return m_bitmap; }
+  operator const_sbitmap () const { return m_bitmap; }
 
 private:
   /* Prevent making a copy that refers to our sbitmap.  */
-- 
2.21.0