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Revert "jemalloc: Reduce diffs to 5.2.1 revert to using JEMALLOC_FALLTHROUGH"

Description

Revert "jemalloc: Reduce diffs to 5.2.1 revert to using JEMALLOC_FALLTHROUGH"

This reverts commit 7bcf5319c1106b761bcb2a4facfeccf1b9db758d.

Turns out this is needed for gcc, at least through gcc 14. This wasn't
documented it the import when it came in, so revert with this note.

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