These messages are the result of an optimization Workstation 11 uses for inter-processor interrupts between virtual CPUs. The interrupt vector used for this purpose is 0xff, which is the Linux spurious APIC interrupt vector. In some cases, an inter-processor interrupt may arrive on a physical processor after Workstation has relinquished the processor to the host OS. Linux will discard the interrupt and print this message.
Unless these messages occur with high frequency, they should be innocuous.
The following configuration option should disable the optimization and make the messages stop:
monitor_control.disable_hostedIPI = TRUE
You can add this setting to /etc/vmware/config, and it will take effect for all VMs the next time they are powered on.