bug#67141: 30.0.50; Missing element in the backtrace

[Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

>> It impacts debugging and profiling, in my experience.
> I see, the outcome for me is that we should offer a way for the user to
> force the use of funcall.  Unfortunatelly ATM if one writes like
> (funcall 'eval ...) it gets optimized.  Maybe even a funcall wrapper
> written in Elisp would be sufficient?

FWIW, for the specific example in the bug report, I'd argue that we
should never call `Feval` directly because a call to `eval`
is a pretty strong hint that speed is probably not a priority.
Similarly I'd expect that most calls to `mapcar` won't benefit very much
from a direct call because the cost of preparing the call
(constructing a closure to pass to `mapcar`) and running the loop is
probably high enough to dwarf the function call itself.


        Stefan