RFR: JDK-8318671: Potential uninitialized uintx value after JDK-8317683 [v2]

[Thomas Stuefe]

> When using 'MemStat' CompileCommand, we accidentally register the command if an invalid suboption had been specified. Fixed, added regression test (verified).

Thomas Stuefe has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'openjdk:master' into JDK-8318671-Potential-uninitialized-uintx-value-after-JDK-8317683
 - JDK-8318671-Potential-uninitialized-uintx-value-after-JDK-8317683

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16335/files
  - new: https://git.openjdk.org/jdk/pull/16335/files/bdcd4e68..3e563292

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16335&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16335&range=00-01

  Stats: 5653 lines in 190 files changed: 3222 ins; 1634 del; 797 mod
  Patch: https://git.openjdk.org/jdk/pull/16335.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16335/head:pull/16335

PR: https://git.openjdk.org/jdk/pull/16335