[v2] x86/PV: issue branch prediction barrier when switching 64-bit guest to kernel mode

Description:

patch 4 of series https://patchwork.kernel.org/project/xen-devel/list/?series=721765

https://lore.kernel.org/xen-devel/06591b64-2f05-a4cc-a2f3-a74c3c4a76d6@suse.com/

Status: In review.

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