[gcc r14-4800] rust: build failure after NON_DEPENDENT_EXPR removal [PR111899]

[Patrick Palka <ppalka@gcc.gnu.org>]

https://gcc.gnu.org/g:5ac53c025e08b4c464b02cfc595e422813023c81

commit r14-4800-g5ac53c025e08b4c464b02cfc595e422813023c81
Author: Patrick Palka <ppalka@redhat.com>
Date:   Fri Oct 20 13:36:11 2023 -0400

    rust: build failure after NON_DEPENDENT_EXPR removal [PR111899]
    
    This patch removes stray NON_DEPENDENT_EXPR checks following the removal
    of this tree code from the C++ FE.  (Since this restores the build I
    supppose it means the Rust FE never creates NON_DEPENDENT_EXPR trees in
    the first place, so no further analysis is needed.)
    
            PR rust/111899
    
    gcc/rust/ChangeLog:
    
            * backend/rust-constexpr.cc (potential_constant_expression_1):
            Remove NON_DEPENDENT_EXPR handling.
            * backend/rust-tree.cc (mark_exp_read): Likewise.
            (mark_use): Likewise.
            (lvalue_kind): Likewise.

Diff:
---
 gcc/rust/backend/rust-constexpr.cc | 1 -
 gcc/rust/backend/rust-tree.cc      | 3 ---
 2 files changed, 4 deletions(-)

diff --git a/gcc/rust/backend/rust-constexpr.cc b/gcc/rust/backend/rust-constexpr.cc
index b28fa27b2d00..a7ae4166ea0c 100644
--- a/gcc/rust/backend/rust-constexpr.cc
+++ b/gcc/rust/backend/rust-constexpr.cc
@@ -6151,7 +6151,6 @@ potential_constant_expression_1 (tree t, bool want_rval, bool strict, bool now,
     case CLEANUP_POINT_EXPR:
     case EXPR_STMT:
     case PAREN_EXPR:
-    case NON_DEPENDENT_EXPR:
       /* For convenience.  */
     case LOOP_EXPR:
     case EXIT_EXPR:
diff --git a/gcc/rust/backend/rust-tree.cc b/gcc/rust/backend/rust-tree.cc
index 66e859cd70c6..7040c75f8257 100644
--- a/gcc/rust/backend/rust-tree.cc
+++ b/gcc/rust/backend/rust-tree.cc
@@ -72,7 +72,6 @@ mark_exp_read (tree exp)
     case ADDR_EXPR:
     case INDIRECT_REF:
     case FLOAT_EXPR:
-    case NON_DEPENDENT_EXPR:
     case VIEW_CONVERT_EXPR:
       mark_exp_read (TREE_OPERAND (exp, 0));
       break;
@@ -128,7 +127,6 @@ mark_use (tree expr, bool rvalue_p, bool read_p,
   switch (TREE_CODE (expr))
     {
     case COMPONENT_REF:
-    case NON_DEPENDENT_EXPR:
       recurse_op[0] = true;
       break;
     case COMPOUND_EXPR:
@@ -4520,7 +4518,6 @@ lvalue_kind (const_tree ref)
 	 lvalues.  */
       return (DECL_NONSTATIC_MEMBER_FUNCTION_P (ref) ? clk_none : clk_ordinary);
 
-    case NON_DEPENDENT_EXPR:
     case PAREN_EXPR:
       return lvalue_kind (TREE_OPERAND (ref, 0));