hg: jdk9/hs: 8165315: [ppc] Port "8133749: NMT detail stack trace cleanup"

[chris.plummer at oracle.com]

Changeset: 01852aa3235d
Author:    goetz
Date:      2016-09-02 15:04 +0200
URL:       http://hg.openjdk.java.net/jdk9/hs/rev/01852aa3235d

8165315: [ppc] Port "8133749: NMT detail stack trace cleanup"
Summary: Also add methods to check for slow/fastdebug to Platform.java.
Reviewed-by: simonis, cjplummer, dholmes

! test/lib/jdk/test/lib/Platform.java