RFR (XS): 8167995: -Xlog:defaultmethods=debug: lengthy method descriptor triggers "StringStream is re-allocated with a different ResourceMark"

[Rachel Protacio]

Hi,

Please review this small fix, which removes two nested ResourceMark's 
that were causing problems with defaultmethods logging.

Bug: https://bugs.openjdk.java.net/browse/JDK-8167995
Open webrev: http://cr.openjdk.java.net/~rprotacio/8167995.00/

Tested with JPRT.

Thanks!
Rachel