1: NOP out most XPTI entry/exit code when it's not in use
2: disable XPTI when RDCL_NO
3: x86: log XPTI enabled status
4: use %r12 to write zero into xen_cr3
5: reduce .text.entry
6: avoid double CR3 reload when switching to guest user mode

Signed-off-by: Jan Beulich <jbeul...@suse.com>

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