RFR(T): 8229925: [s390] Exception check missing in interpreter

[Doerr, Martin]

Hi,

we have sporadically seen "assert(!(((ThreadShadow*)__the_thread__)->has_pending_exception())) failed: Should not have any exceptions pending" on s390 while running jtreg test "vmTestbase/nsk/jvmti/scenarios/capability/CM03/cm03t001".
The VM asserts that no exception is pending after a backedge counter overflow. The unexpected pending exception found in frequency_counter_overflow_inner is an instance of java.lang.ThreadDeath which got installed asynchronously by the test via JVMTI StopThread.
The VM call to InterpreterRuntime::build_method_counters misses an exception check in the s390 implementation. This is necessary for asynchronous exceptions which get installed by this test.

The explanation may not be trivial, but the proposed fix is:
http://cr.openjdk.java.net/~mdoerr/8229925_s390_exception_check/webrev.00/

Best regards,
Martin