[gcc r14-8565] gccrs: ast: Add NodeId to UseTree base class

[gcc r14-8565] gccrs: ast: Add NodeId to UseTree base class

[Arthur Cohen]

https://gcc.gnu.org/g:1133c1c671d91243b54dd5f6d2fed658ce1f8d9a

commit r14-8565-g1133c1c671d91243b54dd5f6d2fed658ce1f8d9a
Author: Arthur Cohen <arthur.cohen@embecosm.com>
Date:   Wed Aug 23 13:49:24 2023 +0200

    gccrs: ast: Add NodeId to UseTree base class
    
    gcc/rust/ChangeLog:
    
            * ast/rust-item.h (class UseTree): Add `node_id` member.

Diff:
---
 gcc/rust/ast/rust-item.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/gcc/rust/ast/rust-item.h b/gcc/rust/ast/rust-item.h
index 2c0e45962cea..3480d126bc03 100644
--- a/gcc/rust/ast/rust-item.h
+++ b/gcc/rust/ast/rust-item.h
@@ -940,6 +940,7 @@ protected:
 class UseTree
 {
   location_t locus;
+  NodeId node_id;
 
 public:
   enum Kind
@@ -975,6 +976,7 @@ public:
   virtual Kind get_kind () const = 0;
 
   location_t get_locus () const { return locus; }
+  NodeId get_node_id () const { return node_id; }
 
   virtual void accept_vis (ASTVisitor &vis) = 0;
 
@@ -982,7 +984,9 @@ protected:
   // Clone function implementation as pure virtual method
   virtual UseTree *clone_use_tree_impl () const = 0;
 
-  UseTree (location_t locus) : locus (locus) {}
+  UseTree (location_t locus)
+    : locus (locus), node_id (Analysis::Mappings::get ()->get_next_node_id ())
+  {}
 };
 
 // Use tree with a glob (wildcard) operator
@@ -1182,7 +1186,7 @@ public:
 
   Kind get_kind () const override { return Rebind; }
 
-  SimplePath get_path () const
+  const SimplePath &get_path () const
   {
     rust_assert (has_path ());
     return path;