RFR: Windows compiler does not support variable length arrays [v2]

[William Kemper]

> Windows compiler does not support variable length arrays

William Kemper has updated the pull request incrementally with one additional commit since the last revision:

  Avoid narrowing conversion

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Changes:
  - all: https://git.openjdk.org/shenandoah/pull/151/files
  - new: https://git.openjdk.org/shenandoah/pull/151/files/e56738e7..a14bc52f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=shenandoah&pr=151&range=01
 - incr: https://webrevs.openjdk.org/?repo=shenandoah&pr=151&range=00-01

  Stats: 3 lines in 2 files changed: 0 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/shenandoah/pull/151.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah pull/151/head:pull/151

PR: https://git.openjdk.org/shenandoah/pull/151