Disallow different lhist bounds in single map
Disallow different lhist bounds in single map

lhist bounds were stored per map, and because of that assigning multiple
lhists with different bounds to a single map lead to the histogram being
printed only with the last set of bounds.

Hence add an error in case the user attempts to do this, reporting that
this is unsupported.

Fixes #2121

iovisor/bpftrace,iovisor/bpftrace,iovisor/bpftrace,iovisor/bpftrace