Optimizes membership checking for the MacroEvaluator Session's ExpansionInfo pool. #1030
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Description of changes:
Profiling showed significant time being spent in IdentityHashMap methods here. This PR proposes using a simple boolean check. I measured performance using ion-java-benchmark-cli over some real-world data containing many macro invocations.
Before: 311 ms/op
After: 269 ms/op (-13.5%)
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.