RFR: 8274261: Use enhanced-for instead of plain 'for' in jdk.jcmd

[Chris Plummer]

On Fri, 24 Sep 2021 07:30:02 GMT, Andrey Turbanov <github.com+741251+turbanoff at openjdk.org> wrote:

> There are few places in code where manual `for` loop is used with Iterator to iterate over Collection or Array.
> Instead of manual `for` cycles it's preferred to use enhanced-for cycle instead: it's less verbose, makes code easier to read and it's less error-prone.
> It doesn't have any performance impact: javac compiler generates similar code when compiling enhanced-for cycle.
> 
> One strange thing I also noticed is static field `sun.tools.jstat.Parser#reservedWords`, which filled in `Parser` constructor. Reworked to initialize it once.

Marked as reviewed by cjplummer (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5673