[gcc r12-4391] Add debug helpers for auto_bitmap.

[gcc r12-4391] Add debug helpers for auto_bitmap.

[Aldy Hernandez]

https://gcc.gnu.org/g:3d0a7271b383c95d5c8dc9647966517a61e71abb

commit r12-4391-g3d0a7271b383c95d5c8dc9647966517a61e71abb
Author: Aldy Hernandez <aldyh@redhat.com>
Date:   Wed Oct 13 10:04:39 2021 +0200

    Add debug helpers for auto_bitmap.
    
    Using debug() on an auto_bitmap from gdb doesn't work because the
    implicit conversion from auto_bitmap to bitmap_head doesn't work
    from within a debugging session.  This patch adds the convenience
    functions for auto_bitmap.
    
    gcc/ChangeLog:
    
            * bitmap.c (debug): New overloaded function for auto_bitmaps.
            * bitmap.h (debug): Same.

Diff:
---
 gcc/bitmap.c | 12 ++++++++++++
 gcc/bitmap.h |  3 +++
 2 files changed, 15 insertions(+)

diff --git a/gcc/bitmap.c b/gcc/bitmap.c
index b915fdfbb54..98c6d0b9e05 100644
--- a/gcc/bitmap.c
+++ b/gcc/bitmap.c
@@ -2830,6 +2830,18 @@ debug (const bitmap_head *ptr)
     fprintf (stderr, "<nil>\n");
 }
 
+DEBUG_FUNCTION void
+debug (const auto_bitmap &ref)
+{
+  debug ((const bitmap_head &) ref);
+}
+
+DEBUG_FUNCTION void
+debug (const auto_bitmap *ptr)
+{
+  debug ((const bitmap_head *) ptr);
+}
+
 void
 bitmap_head::dump ()
 {
diff --git a/gcc/bitmap.h b/gcc/bitmap.h
index 0846f79665d..1bddcdbfaee 100644
--- a/gcc/bitmap.h
+++ b/gcc/bitmap.h
@@ -964,6 +964,9 @@ class auto_bitmap
   bitmap_head m_bits;
 };
 
+extern void debug (const auto_bitmap &ref);
+extern void debug (const auto_bitmap *ptr);
+
 /* Base class for bitmap_view; see there for details.  */
 template<typename T, typename Traits = array_traits<T> >
 class base_bitmap_view