RFR: 8358706: Integer overflow with -XX:MinOopMapAllocation=-1

[Casper Norrbin]

Hi everyone,

Passing a negative value to `-XX:MinOopMapAllocation` could trigger an integer overflow. This value is used as the initial size for the `OopMap` `GrowableArray` list inside `OopMapSet`. Negative inputs hits an assert when allocating for `GrowableArray`. Restricting this flag to positive values ensures we get a clear error message instead of a crash.

Testing:
- Oracle tier 1
- Local tests with `-XX:MinOopMapAllocation=x`, covering both valid and invalid values.

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Commit messages:
 - constraint on MinOopMapAllocation

Changes: https://git.openjdk.org/jdk/pull/28576/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28576&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8358706
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28576.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28576/head:pull/28576

PR: https://git.openjdk.org/jdk/pull/28576