Trigger kernel heuristic for execmode=KERNEL not KERNEL+GUEST_USER+HYPERVISOR.
Trigger kernel heuristic for execmode=KERNEL not KERNEL+GUEST_USER+HYPERVISOR.

A given sample includes a misc field indicating whether the sample happened
while executing kernel mode, user mode, guest kernel, or guest user (among
other things). A heuristic to point the "main" mmap at the kernel triggered
whenever the misc field's lowest bit was set, rather than when it was KERNEL.

GUEST_USER == 0b101 and HYPERVISOR=0b011 both have the bit set, but aren't
appropriate for the heuristic.
PiperOrigin-RevId: 172140214

google/perf_data_converter,google/perf_data_converter,google/perf_data_converter