KVM: VMX: Access @flags as a 32-bit value in __vmx_vcpu_run()

Access @flags using 32-bit operands when saving and testing @flags for
VMX_RUN_VMRESUME, as using 8-bit operands is unnecessarily fragile due
to relying on VMX_RUN_VMRESUME being in bits 0-7.  The behavior of
treating @flags a single byte is a holdover from when the param was
"bool launched", i.e. is not deliberate.

Cc: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Link: https://lore.kernel.org/r/20221119003747.2615229-1-seanjc@google.com


Signed-off-by: Sean Christopherson <seanjc@google.com>