The aspect of the function the second patch here changes has been
puzzling me for many years. I finally thought I ought to make an
attempt at reducing this to just a single get_page_from_l1e()
invocation. The first patch mainly helps readability (of the code
in general as well as the second patch).

Note that the first patch here takes "VMX: use a single, global APIC
access page" as a prereq; it could be re-based ahead of that one.

1: re-use variables in shadow_get_page_from_l1e()
2: streamline shadow_get_page_from_l1e()

Jan