8158525: Update a few java/net tests to use the loopback address instead of the host address Reviewed-by: rriggs

8157892: StackFrame::getFileName returns null when a source file exists for native methods 8157977: getByteCodeIndex method from StackFrame does not return negative number when StackFrame is a native frame Reviewed-by: dfuchs, bchristi

Merge

8158482: regex UNICODE_CHARACTER_CLASS flag cannot be disabled with an embedded flag expression Reviewed-by: bpb