Add flags for CR0, CR4 and XCR0, as well as extra checks for modification of XCR0#272

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ethindp wants to merge 17 commits intorust-osdev:nextfrom

Commits on Sep 12, 2019

Added CR4 register to control registers list. Need to document bits.
ethindp
committed

Commits on Oct 4, 2020

Merged upstream code in x86_64 for control registers
ethindp
committed

Commits on Apr 1, 2021

Merge remote-tracking branch 'upstream/master'
ethindp
committed

Commits on May 30, 2021

Commits on May 31, 2021

Improve Cross-Doc links
josephlr
committed

Commits on Jun 28, 2021