[gcc r12-1086] Tweak Wstringop-overflow-55.c test.

[Aldy Hernandez <aldyh@gcc.gnu.org>]

https://gcc.gnu.org/g:95bef94c6c6c6cb7bf640068aea77c209bca7c65

commit r12-1086-g95bef94c6c6c6cb7bf640068aea77c209bca7c65
Author: Aldy Hernandez <aldyh@redhat.com>
Date:   Thu May 27 09:32:42 2021 +0200

    Tweak Wstringop-overflow-55.c test.
    
    On x86-32 warn_ptrdiff_anti_range_add() and warn_int_anti_range()
    degrade to the same function so ICF is folding the latter into a call
    into the former.  This is causing no warnings to be emitted for
    warn_int_anti_range.
    
    Fixed by passing -fno-ipa-icf.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.dg/Wstringop-overflow-55.c: Pass -fno-ipa-icf.

Diff:
---
 gcc/testsuite/gcc.dg/Wstringop-overflow-55.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/testsuite/gcc.dg/Wstringop-overflow-55.c b/gcc/testsuite/gcc.dg/Wstringop-overflow-55.c
index 8df5cb629ae..c3c2dbe06dd 100644
--- a/gcc/testsuite/gcc.dg/Wstringop-overflow-55.c
+++ b/gcc/testsuite/gcc.dg/Wstringop-overflow-55.c
@@ -1,6 +1,6 @@
 /* Verify that offsets in "anti-ranges" are handled correctly.
    { dg-do compile }
-   { dg-options "-O2 -Wall -ftrack-macro-expansion=0" } */
+   { dg-options "-O2 -Wall -ftrack-macro-expansion=0 -fno-ipa-icf" } */
 
 typedef __PTRDIFF_TYPE__ ptrdiff_t;
 typedef __SIZE_TYPE__    size_t;