[gcc r13-4820] libgccjit: silent 2 Clang warnings

[gcc r13-4820] libgccjit: silent 2 Clang warnings

[Martin Liska]

https://gcc.gnu.org/g:3e030227eabad2a0107c1d87b5648e6c3584e273

commit r13-4820-g3e030227eabad2a0107c1d87b5648e6c3584e273
Author: Martin Liska <mliska@suse.cz>
Date:   Wed Dec 21 08:52:35 2022 +0100

    libgccjit: silent 2 Clang warnings
    
    The make silent the following 2 warnings:
    
    jit/jit-playback.h:785:16: warning: private field 'm_source_file' is not used [-Wunused-private-field]
    jit/jit-playback.h:804:16: warning: private field 'm_line' is not used [-Wunused-private-field]
    
    gcc/jit/ChangeLog:
    
            * jit-playback.h: Use unused attribute.

Diff:
---
 gcc/jit/jit-playback.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/jit/jit-playback.h b/gcc/jit/jit-playback.h
index 214f399f45c..43e92d67d74 100644
--- a/gcc/jit/jit-playback.h
+++ b/gcc/jit/jit-playback.h
@@ -782,7 +782,7 @@ public:
   vec<location *> m_locations;
 
 private:
-  source_file *m_source_file;
+  source_file *m_source_file ATTRIBUTE_UNUSED;
   int m_line_num;
 };
 
@@ -801,7 +801,7 @@ public:
 
 private:
   recording::location *m_recording_loc;
-  source_line *m_line;
+  source_line *m_line ATTRIBUTE_UNUSED;
   int m_column_num;
 };