KVM: VMX: Process PIR using 64-bit accesses on 64-bit kernels

Process the PIR at the natural kernel width, i.e. in 64-bit chunks on
64-bit kernels, so that the worst case of having a posted IRQ in each
chunk of the vIRR only requires 4 loads and xchgs from/to the PIR, not 8.

Deliberately use a "continue" to skip empty entries so that the code is a
carbon copy of handle_pending_pir(), in anticipation of deduplicating KVM
and posted MSI logic.

Suggested-by: Jim Mattson <jmattson@google.com>
Link: https://lore.kernel.org/r/20250401163447.846608-6-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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