git: openjdk/mobile: 8221623: Add StackWalker micro benchmarks to jdk repo

[duke]

Changeset: 916bbc23
Author:    Brent Christian <bchristi at openjdk.org>
Date:      2019-09-25 14:33:44 +0000
URL:       https://github.com/openjdk/mobile/commit/916bbc23

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