Implement Unlimited RCU Updates and Circular Buffer Support

The SimpleRcu class is enhanced to support an unlimited update mode using a circular buffer, size cap is 100.

#deterministic-bmc

PiperOrigin-RevId: 846517199
Change-Id: Ic9e95b7d9fb73b56b6545645e342af22796c421c
diff --git a/gbmcweb b/gbmcweb
index e801f29..b6acd26 160000
--- a/gbmcweb
+++ b/gbmcweb
@@ -1 +1 @@
-Subproject commit e801f295aa7fc8b0b6eeba96b2b1e1b89389e9c3
+Subproject commit b6acd2675c2c7085b31021d3c15b99cd3d1b5520