Removed ibrs_enhanced

[jvhaarst]

Our AMD EPYC 9655 doesn't have this flag, so archspec identifies it as a zen4.

[jvhaarst]

On the machine:

lscpu | grep -e Model -e  Flags
Model name:                         AMD EPYC 9655 96-Core Processor
BIOS Model name:                    AMD EPYC 9655 96-Core Processor                  CPU @ 2.6GHz
Model:                              2
Flags:                              fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 pcid sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 invpcid_single hw_pstate ssbd mba ibrs ibpb stibp vmmcall fsgsbase tsc_adjust bmi1 avx2 smep bmi2 invpcid cqm rdt_a avx512f avx512dq rdseed adx smap avx512ifma clflushopt clwb avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local avx_vnni avx512_bf16 clzero irperf xsaveerptr rdpru wbnoinvd amd_ppin cppc arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif v_spec_ctrl avx512vbmi umip pku ospke avx512_vbmi2 gfni vaes vpclmulqdq avx512_vnni avx512_bitalg avx512_vpopcntdq la57 rdpid bus_lock_detect movdiri movdir64b overflow_recov succor smca avx512_vp2intersect flush_l1d

[jvhaarst]

lscpu | grep Flags | tr ' ' '\n' | sort -u

3dnowprefetch
abm
adx
aes
amd_ppin
aperfmperf
apic
arat
avic
avx
avx2
avx512_bf16
avx512_bitalg
avx512bw
avx512cd
avx512dq
avx512f
avx512ifma
avx512vbmi
avx512_vbmi2
avx512vl
avx512_vnni
avx512_vp2intersect
avx512_vpopcntdq
avx_vnni
bmi1
bmi2
bpext
bus_lock_detect
cat_l3
cdp_l3
clflush
clflushopt
clwb
clzero
cmov
cmp_legacy
constant_tsc
cpb
cppc
cpuid
cqm
cqm_llc
cqm_mbm_local
cqm_mbm_total
cqm_occup_llc
cr8_legacy
cx16
cx8
de
decodeassists
extapic
extd_apicid
f16c
Flags:
flushbyasid
flush_l1d
fma
fpu
fsgsbase
fxsr
fxsr_opt
gfni
ht
hw_pstate
ibpb
ibrs
ibs
invpcid
invpcid_single
irperf
la57
lahf_lm
lbrv
lm
mba
mca
mce
misalignsse
mmx
mmxext
monitor
movbe
movdir64b
movdiri
msr
mtrr
mwaitx
nonstop_tsc
nopl
npt
nrip_save
nx
ospke
osvw
overflow_recov
pae
pat
pausefilter
pcid
pclmulqdq
pdpe1gb
perfctr_core
perfctr_llc
perfctr_nb
pfthreshold
pge
pku
pni
popcnt
pse
pse36
rapl
rdpid
rdpru
rdrand
rdseed
rdt_a
rdtscp
rep_good
sep
sha_ni
skinit
smap
smca
smep
ssbd
sse
sse2
sse4_1
sse4_2
sse4a
ssse3
stibp
succor
svm
svm_lock
syscall
tce
topoext
tsc
tsc_adjust
tsc_scale
umip
vaes
vgif
vmcb_clean
vme
vmmcall
vpclmulqdq
v_spec_ctrl
v_vmsave_vmload
wbnoinvd
wdt
xgetbv1
xsave
xsavec
xsaveerptr
xsaveopt
xsaves