New code for 5.16:

 * Bug fixes and cleanups for kernel memory allocation usage, this time
   without touching the mm code.
 * Refactor the log recovery mechanism that preserves held resources
   across a transaction roll so that it uses the exact same mechanism
   that we use for that during regular runtime.
 * Fix bugs and tighten checking around btree heights.
 * Remove more old typedefs.
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