intel/compiler: add ASSERTED annotation to avoid "unused variable" warning

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>

src/intel/compiler/brw_eu.cpp

@@ -396,9 +396,10 @@ bool brw_try_override_assembly(struct brw_codegen *p, int start_offset,
    read(fd, p->store + start_offset, sb.st_size);
    close(fd);
 
-   bool valid = brw_validate_instructions(p->devinfo, p->store,
-                                          start_offset, p->next_insn_offset,
-                                          0);
+   ASSERTED bool valid =
+      brw_validate_instructions(p->devinfo, p->store,
+                                start_offset, p->next_insn_offset,
+                                0);
    assert(valid);
 
    return true;