[lworld] RFR: 8373347: [lworld] Minor cleanups in the memory directory

[Frederic Parain]

On Tue, 9 Dec 2025 12:29:28 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> There are a few left-over blank line changes, redundant includes, and unused code in the memory/ directory. I suggest that we clean those out to make it nicer to review the patch.

It is a remain of an experiment to use a small thread-local area to store buffered values, which are often short lived, with a kind of automatic reclamation based on frame exits (I'm simplifying here). The idea was to avoid filling the Java heap with those buffered values. It worked but performance was bad. Browsing interpreter frames to find which values in this thread-local area were still alive was expensive, and the ratio cost/amount_of_memory_freed was not good. At the end, the Java heap GC was more efficient to handle those short lived buffered values, especially with generational GCs.

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PR Comment: https://git.openjdk.org/valhalla/pull/1781#issuecomment-3632909644