RFR: 8262721: Add Tests to verify single iteration loops are properly optimized

[Roland Westrelin]

On Tue, 8 Feb 2022 09:02:33 GMT, Nils Eliasson <neliasso at openjdk.org> wrote:

>> That came up in previous:
>> 
>> https://github.com/openjdk/jdk/pull/2529#discussion_r583054321
>
> Looks good! Approved.

@neliasso @chhagedorn thanks for the reviews.

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PR: https://git.openjdk.java.net/jdk/pull/7368