RFR 8147039 : Incorrect locals and operands in compiled frames

[Brent Christian]

Hi,

Please review this change which fixes buggy behavior (including SEGV) in 
the experimental LiveStackFrame feature of StackWalker.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8147039
Webrev:
http://cr.openjdk.java.net/~bchristi/8147039/webrev.02/

As suggested in the bug report, stack walking is reimplemented using 
javaVFrame/vframe::java_sender.  The native StackWalkerAnchor class is 
updated (and renamed) with a similar interface and function to 
vframeStream.  I've also removed the now-unneeded 
vframeStreamCommon::java_frame() function, added by 8140450.

Thanks,
-Brent