Speed up idiv test (dont test int32 as thoroughly)
Fix handling of __clock() builtin for "generic" targets.
Fix (preexisting) bugs in generic-32/64.h with type of "__any", etc.

This should be a bool, not a one-wide vector of bools.  The equivalent
fix was previously made in generic-16.h, but not made here.  (Note that
many tests are still failing with these targets, but at least they
compile properly now.)