RFR: 8252114: Windows-AArch64: Enable and test ZGC and ShenandoahGC [v2]

[Monica Beckwith]

> ZGC and ShenandoahGC are two low latency GCs in OpenJDK HotSpot. We will enable and run microbenchmarks and scaling
> tests for both. After enabling, I ran JTRegs, a few micros, and SPECJBB2015 (heap and multi-JVM) scaling tests for both
> the GCs.

Monica Beckwith has updated the pull request incrementally with one additional commit since the last revision:

  x$OPENJDK_TARGET_CPU" = "xaarch64"
  
  Incorporating Aleksey's comments to incorporate 'x'

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/97/files
  - new: https://git.openjdk.java.net/jdk/pull/97/files/10186339..49845fd9

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=97&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=97&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/97.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/97/head:pull/97

PR: https://git.openjdk.java.net/jdk/pull/97