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The IR backend appears to have changed the way constructors are generated.  This test works under the old backend, but with the IR backend Jackson is unable to find the `@JsonCreator`-annotated constructor <https://github.com/FasterXML/jackson-module-kotlin/blob/kotlin-jvm-ir-backend/src/test/kotlin/com/fasterxml/jackson/module/kotlin/test/github/Github145.kt#L33>

Diffing the bytecode from the old backend and the new (IR) makes it clear why—the `@JsonCreator` (<https://github.com/FasterXML/jackson-annotations/blob/master/src/main/java/com/fasterxml/jackson/annotation/JsonCreator.java#L46>) annotation isn’t present in the IR-generator bytecode

I have a branch demonstrating this (it just turns on the IR compiler) here <https://github.com/FasterXML/jackson-module-kotlin/commits/kotlin-jvm-ir-backend>

And the associated test failures <https://app.circleci.com/pipelines/github/FasterXML/jackson-module-kotlin/225/workflows/5bf90210-e76c-446a-b6f4-3c4e142c8a99/jobs/861>

Created an issue - <https://youtrack.jetbrains.com/issue/KT-45298>.