[gcc r13-8516] m32r: Fix up m32r_setup_incoming_varargs [PR114175]

[Jakub Jelinek]

https://gcc.gnu.org/g:f3af5a241c820e564ef13614ae0ea7a57237bd50

commit r13-8516-gf3af5a241c820e564ef13614ae0ea7a57237bd50
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed Mar 20 16:59:43 2024 +0100

    m32r: Fix up m32r_setup_incoming_varargs [PR114175]
    
    Like for x86-64, alpha or rs6000, m32r seems to be affected too.
    
    Just visually checked differences in c23-stdarg-9.c assembly in a cross
    without/with the patch, committed to trunk.
    
    2024-03-20  Jakub Jelinek  <jakub@redhat.com>
    
            PR target/114175
            * config/m32r/m32r.cc (m32r_setup_incoming_varargs): Only skip
            function arg advance for TYPE_NO_NAMED_ARGS_STDARG_P functions
            if arg.type is NULL.
    
    (cherry picked from commit 921eb457c5b105bcd84eaeac22067e9b03d5b9d1)

Diff:
---
 gcc/config/m32r/m32r.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/config/m32r/m32r.cc b/gcc/config/m32r/m32r.cc
index 5a788e29515..f4ef594499b 100644
--- a/gcc/config/m32r/m32r.cc
+++ b/gcc/config/m32r/m32r.cc
@@ -1290,7 +1290,8 @@ m32r_setup_incoming_varargs (cumulative_args_t cum,
   if (!TYPE_NO_NAMED_ARGS_STDARG_P (TREE_TYPE (current_function_decl)))
     gcc_assert (arg.mode != BLKmode);
 
-  if (!TYPE_NO_NAMED_ARGS_STDARG_P (TREE_TYPE (current_function_decl)))
+  if (!TYPE_NO_NAMED_ARGS_STDARG_P (TREE_TYPE (current_function_decl))
+      || arg.type != NULL_TREE)
     first_anon_arg = (ROUND_ADVANCE_CUM (*get_cumulative_args (cum),
 					 arg.mode, arg.type)
 		      + ROUND_ADVANCE_ARG (arg.mode, arg.type));