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

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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jemalloc: Retire SWAP_RESERVE_* compat shims

We no longer need these compat shims. They were needed for FreeBSD 12
and earlier.

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jemalloc: Retire ifdef for ELF_BSDF_VMNOOVERCOMMIT

ELF_BSDF_VMNOOVERCOMMIT was introduced in time for stable/13 (but not
stable/12), so is now in all supported branches. We're highly unlikely
to mer

jemalloc: Retire ifdef for ELF_BSDF_VMNOOVERCOMMIT

ELF_BSDF_VMNOOVERCOMMIT was introduced in time for stable/13 (but not
stable/12), so is now in all supported branches. We're highly unlikely
to merge future versions to stable/13 let alone anything earlier.

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jemalloc: Reduce diffs to 5.2.1 revert to using JEMALLOC_FALLTHROUGH

In the import of 5.2.1 (c5ad81420c495), JEMALLOC_FALLTHROUGH was changed
to break (judging by the tagged upstream sources). This

jemalloc: Reduce diffs to 5.2.1 revert to using JEMALLOC_FALLTHROUGH

In the import of 5.2.1 (c5ad81420c495), JEMALLOC_FALLTHROUGH was changed
to break (judging by the tagged upstream sources). This changes it back
to upstream. No functional change: this is just a textual change (though
the fallthrough macro doesn't expand to break).

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jemalloc: Move generated files into lib/libc tree

Make it easire to update jemalloc by moving the FreeBSD specific files
and the generated files into lib/libc. This allows us to regenerate them
more

jemalloc: Move generated files into lib/libc tree

Make it easire to update jemalloc by moving the FreeBSD specific files
and the generated files into lib/libc. This allows us to regenerate them
more easily, and emphasizes a bit that we may have to regenerate stuff
from upstream.

This is necessary to also unthin the import from the vendor branch as
well (which will be needed to simplify the imports in the future since
we are trying to use contrib/jemalloc for two different things).

No functional change.

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jemalloc: Move generated jemalloc.3 into lib/libc tree

The more generated things that are in contrib/jemalloc tree, the more
chances for interference goes way up. So, move this file into our
lib/lib

jemalloc: Move generated jemalloc.3 into lib/libc tree

The more generated things that are in contrib/jemalloc tree, the more
chances for interference goes way up. So, move this file into our
lib/libc tree. I didn't add a 'generated file' line / info, but this is
funky enough I don't think we need that. We do add things to the man
page, and that should be tracked in the contrib/jemalloc tree to allow
better importing experience.

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jemalloc: Remove obsolete files from the exclusion list

These files are not present upstream, nor in the tree after
autoconf/configure.

Remove the FREEBSD-* from the exclusion list. This likely bre

jemalloc: Remove obsolete files from the exclusion list

These files are not present upstream, nor in the tree after
autoconf/configure.

Remove the FREEBSD-* from the exclusion list. This likely breaks
FREEBSD-upgrade, but that needs to be rewritten for being used with a
vendor branch (or just scaled back to be just a how-to, no the full
script). Remove the dot files, since the upgrade process doesn't create
them.

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