Revert 'Tweak ContainerNonEmptyMap with "int" instead of "bool"'.

I've added the missing ImutProfileInfo [sic] specialization for bool,
so this patch on r194235 is no longer needed.

This reverts r194244 / 2baea2887dfcf023c8e3560e5d4713c42eed7b6b.
Add ImmutableSet profiling info for 'bool'.

Useful for tri-state maps: true, false, and "no data yet".