intel/compiler: print dispatch width when shader fails to compile

Signed-off-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6602>
diff --git a/src/intel/compiler/brw_fs.cpp b/src/intel/compiler/brw_fs.cpp
index 93bb305..c1d3a6a 100644
--- a/src/intel/compiler/brw_fs.cpp
+++ b/src/intel/compiler/brw_fs.cpp
@@ -675,7 +675,8 @@
    failed = true;
 
    msg = ralloc_vasprintf(mem_ctx, format, va);
-   msg = ralloc_asprintf(mem_ctx, "%s compile failed: %s\n", stage_abbrev, msg);
+   msg = ralloc_asprintf(mem_ctx, "SIMD%d %s compile failed: %s\n",
+         dispatch_width, stage_abbrev, msg);
 
    this->fail_msg = msg;