RFR: 8339342: FieldAllocationCount is mostly unused

[Frederic Parain]

On Wed, 4 Sep 2024 12:20:17 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> The only use for this code except for setting static_oop_field_count was for field allocation code before the FieldLayoutBuilder code was introduced, and continues to be unused for the valhalla field layout code.  Removed it.
> Tested with tier1 on linux, windows and macosx platforms.

Looks good to me.
Thank you for the removal of FieldAllocationType.

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Marked as reviewed by fparain (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20850#pullrequestreview-2280196005