[11u] RFR 8216977: ShowHiddenFrames use in java_lang_StackTraceElement::fill_in appears broken

[Aleksey Shipilev]

Original bug:
  https://bugs.openjdk.java.net/browse/JDK-8216977
  https://hg.openjdk.java.net/jdk/jdk/rev/8ec5ad4f5cc3

Patch does not apply cleanly to 11u, because one of the affected hunks was added in 13, with
JDK-8220623. 11u webrev:
  https://cr.openjdk.java.net/~shade/8216977/webrev.11u.01/

There is also a follow-up testbug change, going to request that too.

Testing: tier1, new test (fails without product fix, passes with it)

-- 
Thanks,
-Aleksey