OPNSense/src adce02csys/amd64/amd64 support.S genassym.c, sys/amd64/include pcpu.h

Mitigations for Microarchitectural Data Sampling.

Approved by:    so
Security:       FreeBSD-SA-19:07.mds
Security:       CVE-2018-12126
Security:       CVE-2018-12127
Security:       CVE-2018-12130
Security:       CVE-2019-11091
DeltaFile
+248-0sys/amd64/amd64/support.S
+195-0sys/x86/x86/cpu_machdep.c
+191-0sys/i386/i386/support.s
+5-1sys/i386/include/pcpu.h
+5-1sys/amd64/include/pcpu.h
+3-0sys/amd64/amd64/genassym.c
+3-0sys/i386/i386/genassym.c
+2-0sys/amd64/amd64/exception.S
+2-0sys/x86/include/specialreg.h
+2-0sys/x86/include/x86_var.h
+1-0sys/dev/cpuctl/cpuctl.c
+1-0sys/amd64/amd64/machdep.c
+1-0sys/amd64/amd64/initcpu.c
+1-0sys/i386/i386/exception.s
+1-0sys/i386/i386/initcpu.c
+661-215 files

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