This patch addresses the warnings deprecation and unchecked, which are
impossible to fully suppress.
With this patch, the test-image can be built fully without warnings.
The patch updates non-critical code to use modern solutions for
deprecated methods, where possible. Tested methods have been annotated
with SuppressWarnings instead. I'm leaving it for a future update by the
perf team to reconsider if it's worth testing deprecated methods.
Bug: https://bugs.openjdk.java.net/browse/JDK-8243156
WebRev:
http://cr.openjdk.java.net/~ihse/JDK-8243156-fix-warnings-in-microbenchmark/webrev.01
/Magnus
