[Bug 238294] r347566 adds instructions to support.S that are not supported by Kaby Lake and older

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238294

            Bug ID: 238294
           Summary: r347566 adds instructions to support.S that are not
                    supported by Kaby Lake and older
           Product: Base System
           Version: 11.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: aberg010 at my.hennepintech.edu

support.S now has AVX-512 instructions and my Kaby Lake system can no longer
build the kernel. I do not have a /etc/make.conf.

--- support.o ---
/usr/src/sys/amd64/amd64/support.S:1112:2: error: instruction requires: AVX-512
ISA
 vmovdqa64 %zmm0, %gs:0x3c0
 ^
/usr/src/sys/amd64/amd64/support.S:1113:2: error: instruction requires: AVX-512
ISA
 vpxor %zmm0, %zmm0, %zmm0
 ^
/usr/src/sys/amd64/amd64/support.S:1116:2: error: instruction requires: AVX-512
DQ ISA
 vorpd (%rdx), %zmm0, %zmm0
 ^
/usr/src/sys/amd64/amd64/support.S:1117:2: error: instruction requires: AVX-512
DQ ISA
 vorpd (%rdx), %zmm0, %zmm0
 ^
/usr/src/sys/amd64/amd64/support.S:1129:2: error: instruction requires: AVX-512
ISA
 vmovdqa64 %gs:0x3c0, %zmm0
 ^
*** [support.o] Error code 1

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