MFC r265098

Bump WITNESS_PENDLIST by MAXCPU to account for the
pmap pvlist locks which are scaled by MAXCPU.
MFC r266103

Update dis_tables.c to the latest Illumos version.

This includes decodes of recent Intel instructions, in particular
VT-x and related instructions. This allows the FBT provider to
locate the exit points of routines that include these new
instructions.

Illumos issues:
 3414 Need a new word of AT_SUN_HWCAP bits
 3415 Add isainfo support for f16c and rdrand
 3416 Need disassembler support for rdrand and f16c
 3413 isainfo -v overflows 80 columns
 3417 mdb disassembler confuses rdtscp for invlpg
 1518 dis should support AMD SVM/AMD-V/Pacifica instructions
 1096 i386 disassembler should understand complex nops
 1362 add kvmstat for monitoring of KVM statistics
 1363 add vmregs[] variable to DTrace
 1364 need disassembler support for VMX instructions
 1365 mdb needs 16-bit disassembler support

This corresponds to Illumos-gate (github) version
eb23829ff08a873c612ac45d191d559394b4b408