[gcc r12-3031] Release resources acquired by enable_ranger() [PR101984].

[gcc r12-3031] Release resources acquired by enable_ranger() [PR101984].

[Martin Sebor]

https://gcc.gnu.org/g:81501087758cb0c32e555858cf367e449a09246e

commit r12-3031-g81501087758cb0c32e555858cf367e449a09246e
Author: Martin Sebor <msebor@redhat.com>
Date:   Thu Aug 19 12:42:28 2021 -0600

    Release resources acquired by enable_ranger() [PR101984].
    
    Resolves:
    PR middle-end/101984 - gimple-ssa-warn-access memory leak
    
    gcc/ChangeLog:
    
            PR middle-end/101984
            * gimple-ssa-warn-access.cc (pass_waccess::execute): Also call
            disable_ranger.

Diff:
---
 gcc/gimple-ssa-warn-access.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gcc/gimple-ssa-warn-access.cc b/gcc/gimple-ssa-warn-access.cc
index f3efe564af0..4a2dd9ade77 100644
--- a/gcc/gimple-ssa-warn-access.cc
+++ b/gcc/gimple-ssa-warn-access.cc
@@ -3310,12 +3310,16 @@ pass_waccess::check (basic_block bb)
 unsigned
 pass_waccess::execute (function *fun)
 {
+  /* Create a new ranger instance and associate it with FUN.  */
   m_ranger = enable_ranger (fun);
 
   basic_block bb;
   FOR_EACH_BB_FN (bb, fun)
     check (bb);
 
+  /* Release the ranger instance and replace it with a global ranger.  */
+  disable_ranger (fun);
+
   return 0;
 }