freedreno/decode/crashdec: Limit snapshot BO size

Internal tooling has a 100MB limit.  But ascii85 can do a good job of
compressing BOs that have lots of zero's, so the resulting snapshot file
can be much bigger than the devcoredump.  Avoid this by skipping BOs
that are large enough to probably not be cs/shader/descriptor.

Signed-off-by: Rob Clark <rob.clark@oss.qualcomm.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37727>

src/freedreno/decode/crashdec.c

@@ -553,7 +553,9 @@ decode_bos(void)
             dump_hex_ascii(buf, size, 1);
 
          add_buffer(iova, size, buf);
-         snapshot_gpu_object(iova, size, buf);
+
+         if (size <= 0x40000)
+            snapshot_gpu_object(iova, size, buf);
 
          continue;
       }