hg: jdk/sandbox: 8221623: Add StackWalker micro benchmarks to jdk repo

[chris.hegarty at oracle.com]

Changeset: ac24594d2c8c
Author:    bchristi
Date:      2019-09-25 14:33 -0700
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/ac24594d2c8c

8221623: Add StackWalker micro benchmarks to jdk repo
Reviewed-by: dfuchs, mchung, redestad

+ test/micro/org/openjdk/bench/java/lang/StackWalkBench.java
+ test/micro/org/openjdk/bench/java/util/logging/LoggingRuntimeMicros.java
+ test/micro/org/openjdk/bench/vm/lang/ThrowableRuntimeMicros.java