[11u] RFR 8246381: VM crashes with "Current BasicObjectLock* below than low_mark"

[Zhengyu Gu]

I would like to backport this patch to 11u for parity with Oracle 
11.0.10-oracle.

The original patch does not apply cleanly, due to an extra leading space 
of the following lines in the original patch.

  JRT_ENTRY(void, InterpreterRuntime::profile_method(JavaThread* thread))
+  if (HAS_PENDING_EXCEPTION) {
+    return;
+  }
    // use UnlockFlagSaver to clear and restore the 
_do_not_unlock_if_synchronized
    // flag, in case this method triggers classloading which will call 
into Java.
    UnlockFlagSaver fs(thread);


The original bug: https://bugs.openjdk.java.net/browse/JDK-8246381
The original patch: https://hg.openjdk.java.net/jdk/jdk15/rev/f8cffefd6e9b

11u webrev: http://cr.openjdk.java.net/~zgu/JDK-8246381-11u/webrev.00/

Thanks,

-Zhengyu