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version 1.88, 2020/08/13 15:30:13 version 1.89, 2020/10/12 16:47:20
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         relative branches/calls.  Basically a unique address space for each          relative branches/calls.  Basically a unique address space for each
         kernel boot, similar to the userland fork+exec model described above          kernel boot, similar to the userland fork+exec model described above
         but for the kernel.  Theo de Raadt, June 2017.          but for the kernel.  Theo de Raadt, June 2017.
     <li>      <li>Rearranged i386/amd64 register allocator order in
         Rearranged i386/amd64 register allocator order in  
         <a href="https://man.openbsd.org/clang.1">clang(1)</a>          <a href="https://man.openbsd.org/clang.1">clang(1)</a>
         to reduce polymorphic RET instructions:          to reduce polymorphic RET instructions:
         Todd Mortimer, November 20, 2017.          Todd Mortimer, November 20, 2017.
     <li>      <li>Reencoding of i386/amd64 instruction sequences to avoid
         Reencoding of i386/amd64 instruction sequences to avoid  
         embedded polymorphic RET instructions.  Enhancements to          embedded polymorphic RET instructions.  Enhancements to
         <a href="https://man.openbsd.org/clang.1">clang(1)</a>          <a href="https://man.openbsd.org/clang.1">clang(1)</a>
         Todd Mortimer, April 28, 2018 and onwards.          Todd Mortimer, April 28, 2018 and onwards.
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     <li><b>RETGUARD</b> is a replacement for the <b>stack-protector</b>      <li><b>RETGUARD</b> is a replacement for the <b>stack-protector</b>
         which uses a per-function random cookie (located in the read-only ELF          which uses a per-function random cookie (located in the read-only ELF
         <b>.openbsd.randomdata</b> section) to consistency-check the          <b>.openbsd.randomdata</b> section) to consistency-check the
         return address on the stack.  Implemented for AMD64 and ARM64          return address on the stack.  Implemented for amd64 and arm64
         by Todd Mortimer in OpenBSD 6.4, and for Octeon in OpenBSD 6.7.          by Todd Mortimer in OpenBSD 6.4, for mips64 in OpenBSD 6.7, and
           powerpc/power64 in OpenBSD 6.9.
     <li><b>MAP_CONCEAL</b> addition to      <li><b>MAP_CONCEAL</b> addition to
         <a href="https://man.openbsd.org/mmap.2">mmap(2)</a>          <a href="https://man.openbsd.org/mmap.2">mmap(2)</a>
         disallows memory pages to be written to core dumps, preventing          disallows memory pages to be written to core dumps, preventing
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  Added in v.1.89