RFR: 8332745: Method::is_vanilla_constructor is never used

[Coleen Phillimore]

On Thu, 23 May 2024 13:00:49 GMT, Dan Heidinga <heidinga at openjdk.org> wrote:

> Removed dead code related to identifying empty constructors.  Missed when [JDK-8057777](https://bugs.openjdk.org/browse/JDK-8057777) cleaned up JVM_AllocateNewObject.
> 
> Passes mach5 tier1.

This looks really good.  Thank you for finding this unused code.

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Marked as reviewed by coleenp (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/19367#pullrequestreview-2074659158