In 3 small commits, grouped here:
- x86: x86_msr_op(): Move setting mode up, delineate logical blocks
No functional changes (intended).
- x86: x86_msr_op(): Simplify assertions
Simplify them by moving them into more natural places, i.e., default
cases of 'switch' statements.
No functional change (intended).
- x86: x86_msr_op(): Caution about using MSR_OP_LOCAL
No functional change.