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

[Nils Eliasson]

On Mon, 7 Feb 2022 13:49:27 GMT, Roland Westrelin <roland at openjdk.org> wrote:

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

Looks good! Approved.

-------------

Marked as reviewed by neliasso (Reviewer).

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