[gcc(refs/users/dfaust/heads/btf-type-tag-new-rebase)] dwarf: Add dw_get_die_parent function

[David Faust <dfaust@gcc.gnu.org>]

https://gcc.gnu.org/g:9152a143db240e76491a5bc1c432fe74b6396350

commit 9152a143db240e76491a5bc1c432fe74b6396350
Author: David Faust <david.faust@oracle.com>
Date:   Wed Mar 2 14:58:15 2022 -0800

    dwarf: Add dw_get_die_parent function
    
    gcc/
    
            * dwarf2out.cc (dw_get_die_parent): New function.
            * dwarf2out.h (dw_get_die_parent): Declare it here.

Diff:
---
 gcc/dwarf2out.cc | 8 ++++++++
 gcc/dwarf2out.h  | 1 +
 2 files changed, 9 insertions(+)

diff --git a/gcc/dwarf2out.cc b/gcc/dwarf2out.cc
index e81044b8c48..9429e04cb06 100644
--- a/gcc/dwarf2out.cc
+++ b/gcc/dwarf2out.cc
@@ -5235,6 +5235,14 @@ dw_get_die_sib (dw_die_ref die)
   return die->die_sib;
 }
 
+/* Return a reference to the parent of a given DIE.  */
+
+dw_die_ref
+dw_get_die_parent (dw_die_ref die)
+{
+  return die->die_parent;
+}
+
 /* Add an address constant attribute value to a DIE.  When using
    dwarf_split_debug_info, address attributes in dies destined for the
    final executable should be direct references--setting the parameter
diff --git a/gcc/dwarf2out.h b/gcc/dwarf2out.h
index 656ef94afde..e6962fb4848 100644
--- a/gcc/dwarf2out.h
+++ b/gcc/dwarf2out.h
@@ -455,6 +455,7 @@ extern dw_die_ref lookup_type_die (tree);
 
 extern dw_die_ref dw_get_die_child (dw_die_ref);
 extern dw_die_ref dw_get_die_sib (dw_die_ref);
+extern dw_die_ref dw_get_die_parent (dw_die_ref);
 extern enum dwarf_tag dw_get_die_tag (dw_die_ref);
 
 /* Data about a single source file.  */