[Chapel Merge] Two fixes in OrderedMap

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Branch: refs/heads/master
Revision: a7cdc7b
Author: e-kayrakli
Log Message:

Merge pull request #17463 from e-kayrakli/orderedMap-fixes-2

Two fixes in OrderedMap

This PR fixes two issues with the OrderedMap that was added yesterday:

  • Some iterators didn't have the necessary order-independence pragmas.
    This PR adds that.
  • This code bumped into a memory leak where the workaround was simple,
    so it is added here. The memory leak is recorded in
    https://github.com/Cray/chapel-private/issues/1833.

Trivial, not reviewed

Test: