[gcc r14-8356] ia64: Fix up -Wunused-parameter warning

[Jakub Jelinek]

https://gcc.gnu.org/g:ac98aa7828b5eb94f12d06a275b95581a34392e4

commit r14-8356-gac98aa7828b5eb94f12d06a275b95581a34392e4
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Jan 23 13:57:41 2024 +0100

    ia64: Fix up -Wunused-parameter warning
    
    Since r14-6945-gc659dd8bfb55e02a1b97407c1c28f7a0e8f7f09b
    there is a warning
    ../../gcc/config/ia64/ia64.cc: In function ‘void ia64_start_function(FILE*, const char*, tree)’:
    ../../gcc/config/ia64/ia64.cc:3889:59: warning: unused parameter ‘decl’ [-Wunused-parameter]
     3889 | ia64_start_function (FILE *file, const char *fnname, tree decl)
          |                                                      ~~~~~^~~~
    which presumably for bootstraps breaks the bootstrap.
    While the decl parameter is passed to the ASM_OUTPUT_FUNCTION_LABEL macro,
    that macro actually doesn't use that argument, so the removal of
    ATTRIBUTE_UNUSED was incorrect.
    This patch reverts the first ia64.cc hunk from r14-6945.
    
    2024-01-23  Jeff Law  <jlaw@ventanamicro.com>
                Jakub Jelinek  <jakub@redhat.com>
    
            * config/ia64/ia64.cc (ia64_start_function): Add ATTRIBUTE_UNUSED to
            decl.

Diff:
---
 gcc/config/ia64/ia64.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/config/ia64/ia64.cc b/gcc/config/ia64/ia64.cc
index 53a4444d03b..ac3d56073ac 100644
--- a/gcc/config/ia64/ia64.cc
+++ b/gcc/config/ia64/ia64.cc
@@ -3886,7 +3886,8 @@ ia64_expand_prologue (void)
 /* Output the textual info surrounding the prologue.  */
 
 void
-ia64_start_function (FILE *file, const char *fnname, tree decl)
+ia64_start_function (FILE *file, const char *fnname,
+		     tree decl ATTRIBUTE_UNUSED)
 {
 #if TARGET_ABI_OPEN_VMS
   vms_start_function (fnname);