count.c: Fix panic mode slowness
count.c: Fix panic mode slowness

find_table_pointer() is now called less frequently (due to using
the just-added LHS/RHS nonzero count cache). As a result, panic response
is delayed.

Instead of increasing the timer sampling rate, move its check to
find_table_lrcnt_pointer(), a thing which is expected to terminate panic
mode much faster.

linas/link-grammar,ampli/link-grammar,ampli/link-grammar,opencog/link-grammar,ampli/link-grammar,linas/link-grammar,opencog/link-grammar,opencog/link-grammar,linas/link-grammar,ampli/link-grammar,ampli/link-grammar,ampli/link-grammar,ampli/link-grammar,opencog/link-grammar,opencog/link-grammar,linas/link-grammar,opencog/link-grammar,opencog/link-grammar,ampli/link-grammar,ampli/link-grammar,linas/link-grammar,opencog/link-grammar,opencog/link-grammar,linas/link-grammar,linas/link-grammar,linas/link-grammar,linas/link-grammar