(elp-instrument-package): Don't attempt to instrument autoload functions.
(elp-elapsed-time): New function to calculate the different between
two `current-time' lists. This no longer throws away the top 16 bits
of information.
(elp-wrapper): Use elp-elapsed-time instead of elp-get-time. Also,
call `current-time' as close to the function entrance and exit as
possible so more of the overhead is eliminated from the times.
(elp-get-time): Obsolete, deleted.
(elp-restore-function):
When restoring, do not check assq elp-wrapper
if the symbol-function is a compiled lisp function (i.e. byte coded).
If it is byte-coded, it could not have been instrumented.
Don't do the symbol-function restoration if
the symbol has no function definition.
(elp-instrument-function): Always `restore' the funsym before instrumenting.
Fail if function is an autoload symbol.