RFR: 8274755: Replace 'while' cycles with iterator with enhanced-for in jdk.jdi

[Serguei Spitsyn]

On Sat, 18 Sep 2021 21:35:41 GMT, Andrey Turbanov <github.com+741251+turbanoff at openjdk.org> wrote:

> There are few places in code where manual while loop is used with Iterator to iterate over Collection.
> Instead of manual while 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: java compiler generates similar code when compiling enhanced-for cycle.
> 
> Similar cleanups:
> * https://bugs.openjdk.java.net/browse/JDK-8258006
> * https://bugs.openjdk.java.net/browse/JDK-8257912

Hi Andrey,
It looks good in general but I've inlined one comment.
Also, I need to mention it again that the formatting rules for casts do not require space as in here:
`(InterfaceTypeImpl) interfaceType`
Additional rule is at least to follow the local style in each file.
There are plenty of such spaces added in this PR.
Could you, please, fix them?
Thanks,
Serguei

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PR: https://git.openjdk.java.net/jdk/pull/5577