RFR (XS) 8216977: ShowHiddenFrames use in java_lang_StackTraceElement::fill_in appears broken

[coleen.phillimore at oracle.com]

Summary: Return NULL source file and negative line number for hidden frames.

See bug for more details.   Ran hs tier1-3 on linux-x64-debug and tier1 
on all platforms.

open webrev at http://cr.openjdk.java.net/~coleenp/2019/8216977.01/webrev
bug link https://bugs.openjdk.java.net/browse/JDK-8216977

Thanks,
Coleen