JDK-8179305 caused the following failures, leading to failures in JPRT

JDK-8179593 - guarantee failure in deflate_idle_monitors
JDK-8179606 - assert(!mark->has_bias_pattern()) failed: invariant

Possible reason for the failure:
In JDK-8179305, I reused the "last_frame" object across a Java up call (e.g, LinkResolver::resolve_field_access). Perhaps that did something that invalidates the contents of the last_frame. See http://hg.openjdk.java.net/jdk10/hs/hotspot/rev/601d8c7ab6f6 => search for "@@ -556,20"