[gcc r13-52] c++: tidy auto deduction

[Jason Merrill <jason@gcc.gnu.org>]

https://gcc.gnu.org/g:8189838d823ea65e560c573d38a65edc12f5c2e3

commit r13-52-g8189838d823ea65e560c573d38a65edc12f5c2e3
Author: Jason Merrill <jason@redhat.com>
Date:   Fri Apr 29 14:21:47 2022 -0400

    c++: tidy auto deduction
    
    In r185768 I added the !FUNCTION_DECL check, but we might as well just check
    for variable; nothing else should take this path, and asserting as much
    doesn't regress anything.
    
    gcc/cp/ChangeLog:
    
            * decl.cc (cp_finish_decl): Only consider auto for vars.

Diff:
---
 gcc/cp/decl.cc | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc
index 45206c236c1..16565bf0a0e 100644
--- a/gcc/cp/decl.cc
+++ b/gcc/cp/decl.cc
@@ -8077,7 +8077,7 @@ cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
       && (DECL_INITIAL (decl) || init))
     DECL_INITIALIZED_IN_CLASS_P (decl) = 1;
 
-  if (TREE_CODE (decl) != FUNCTION_DECL
+  if (VAR_P (decl)
       && (auto_node = type_uses_auto (type)))
     {
       tree d_init;
@@ -8105,11 +8105,10 @@ cp_finish_decl (tree decl, tree init, bool init_const_expr_p,
 	  d_init = resolve_nondeduced_context (d_init, tf_warning_or_error);
 	}
       enum auto_deduction_context adc = adc_variable_type;
-      if (VAR_P (decl) && DECL_DECOMPOSITION_P (decl))
+      if (DECL_DECOMPOSITION_P (decl))
 	adc = adc_decomp_type;
       tree outer_targs = NULL_TREE;
       if (PLACEHOLDER_TYPE_CONSTRAINTS_INFO (auto_node)
-	  && VAR_P (decl)
 	  && DECL_LANG_SPECIFIC (decl)
 	  && DECL_TEMPLATE_INFO (decl)
 	  && !DECL_FUNCTION_SCOPE_P (decl))