Clamp the calculation of sb64_target_rate to INT_MAX

Same fix as in libvpx-vp9:
https://chromium-review.googlesource.com/c/webm/libvpx/+/5820131

Bug: b/361617762

Change-Id: I34f7bfca5b7e813092c7374ebbcbc85e34302328

av1/encoder/ratectrl.c

diff --git a/av1/encoder/ratectrl.c b/av1/encoder/ratectrl.c
index dc882f3..007812d 100644
--- a/av1/encoder/ratectrl.c
+++ b/av1/encoder/ratectrl.c
@@ -2292,8 +2292,9 @@
   }
 
   // Target rate per SB64 (including partial SB64s.
-  rc->sb64_target_rate =
-      (int)(((int64_t)rc->this_frame_target << 12) / (width * height));
+  const int64_t sb64_target_rate =
+      ((int64_t)rc->this_frame_target << 12) / (width * height);
+  rc->sb64_target_rate = (int)AOMMIN(sb64_target_rate, INT_MAX);
 }
 
 static void update_alt_ref_frame_stats(AV1_COMP *cpi) {