x86/asm: Add ASMRIP() macro for x86-64 (%rip) suffix (git-fixes).
x86/bugs: Add asm helpers for executing VERW (bsc#1213456).
x86/bugs: Use ALTERNATIVE() instead of mdsuserclear static key (git-fixes). Also add mdsuserclear to kABI severity as it's used purely for mitigation so it's low risk.
x86/cpu, kvm: Move X86FEATURELFENCE_RDTSC to its native leaf (git-fixes).
x86/entry_32: Add VERW just before userspace transition (git-fixes).
x86/entry_64: Add VERW just before userspace transition (git-fixes).