Tested x86_64-pc-linux-gnu, applying to trunk.

-- 8< --

Lewis' r15-5067 fixing the marking of TRAIT_EXPR led me to compare some
other front-end type definitions to their marking in cp_common_init_ts; it
seems we can change tree_common to something smaller in several cases, to
match how they are marked.

gcc/cp/ChangeLog:

        * cp-tree.h (struct ptrmem_cst): Change tree_common to tree_typed.
        (struct tree_trait_expr): Likewise.
        (struct tree_static_assert): Change tree_common to tree_base.
        (struct tree_argument_pack_select): Likewise.
---
 gcc/cp/cp-tree.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h
index 92d1dba6a5c..1a0d5349749 100644
--- a/gcc/cp/cp-tree.h
+++ b/gcc/cp/cp-tree.h
@@ -715,7 +715,7 @@ struct GTY(()) template_parm_index {
 };
 
 struct GTY(()) ptrmem_cst {
-  struct tree_common common;
+  struct tree_typed typed;
   tree member;
   location_t locus;
 };
@@ -1378,14 +1378,14 @@ struct GTY (()) tree_deferred_noexcept {
   (((struct tree_static_assert *)STATIC_ASSERT_CHECK (NODE))->location)
 
 struct GTY (()) tree_static_assert {
-  struct tree_common common;
+  struct tree_base base;
   tree condition;
   tree message;
   location_t location;
 };
 
 struct GTY (()) tree_argument_pack_select {
-  struct tree_common common;
+  struct tree_base base;
   tree argument_pack;
   int index;
 };
@@ -1425,7 +1425,7 @@ extern const struct cp_trait cp_traits[];
   (((struct tree_trait_expr *)TRAIT_EXPR_CHECK (NODE))->locus)
 
 struct GTY (()) tree_trait_expr {
-  struct tree_common common;
+  struct tree_typed typed;
   tree type1;
   tree type2;
   location_t locus;

base-commit: 42a2df0b7985b2a4732ba1c29726ac7aabd5eeae
-- 
2.47.0

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