[gcc r13-6139] rust: Fix rust-tree.cc compilation on SPARC

[Rainer Orth <ro@gcc.gnu.org>]

https://gcc.gnu.org/g:7b8916a6fd098546e4e53e53b37a5153664ba17f

commit r13-6139-g7b8916a6fd098546e4e53e53b37a5153664ba17f
Author: Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
Date:   Mon Feb 20 11:40:24 2023 +0100

    rust: Fix rust-tree.cc compilation on SPARC
    
    This patch
    
    commit 27a89f84c458ae938bc3eb92ad0d594c06fc3b42
    Author: Thomas Schwinge <thomas@codesourcery.com>
    Date:   Fri Feb 17 23:36:20 2023 +0100
    
        '#include "tm_p.h"' in 'gcc/rust/backend/rust-tree.cc'
    
    broke rust bootstrap on SPARC:
    
    In file included from ./tm_p.h:4,
                     from /vol/gcc/src/hg/master/local/gcc/rust/backend/rust-tree.cc:38:
    /vol/gcc/src/hg/master/local/gcc/config/sparc/sparc-protos.h:46:47: error: use of enum 'memmodel' without previous declaration
       46 | extern void sparc_emit_membar_for_model (enum memmodel, int, int);
          |                                               ^~~~~~~~
    
    Fixed by including memmodel.h.  Tested on sparc-sun-solaris2.11 and
    i386-pc-solaris2.11.
    
    2023-02-20  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
    
            gcc/rust:
            * backend/rust-tree.cc: Include memmodel.h.

Diff:
---
 gcc/rust/backend/rust-tree.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/rust/backend/rust-tree.cc b/gcc/rust/backend/rust-tree.cc
index e2595b59aa8..d2d170c23f1 100644
--- a/gcc/rust/backend/rust-tree.cc
+++ b/gcc/rust/backend/rust-tree.cc
@@ -35,6 +35,7 @@
 #include "file-prefix-map.h"
 #include "cgraph.h"
 #include "output.h"
+#include "memmodel.h"
 #include "tm_p.h"
 
 // forked from gcc/c-family/c-common.cc c_global_trees