RFR: JDK-8318671: Potential uninitialized uintx value after JDK-8317683 [v4]

[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 incrementally with one additional commit since the last revision:

  Fix Windows build

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16335/files
  - new: https://git.openjdk.org/jdk/pull/16335/files/1564cf45..287d8106

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16335&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16335&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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