NetBSD/src cQEXg6Psys/kern kern_lwp.c

   Preserve pcu(9) state in fork.

   There should perhaps be a pcu_fork operation to keep this factored
   neatly but this will be simpler to pull up.

   In practical terms, this may not affect most architecture that use
   pcu(9) -- alpha, arm32, mips, powerpc, riscv -- but it does affect
   aarch64, in which v8-v15 are callee-saves, and GCC actually takes
   advantage of them, and for more than just floating-point data too.

   XXX pullup
VersionDeltaFile
1.224+3-2sys/kern/kern_lwp.c
+3-21 files

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