bug#11657: 24.1.50; Byte compiler is a lot slower now, when run interpreted

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: 11657@debbugs.gnu.org
> Date: Sun, 10 Jun 2012 21:10:07 -0400
> 
> > Another would be to add some instrumentation code to the `pcase' macro,
> > to output a message everytime the cache misses.  E.g. use the patch below.
> 
> I tried that and found that the `pcase-let' macro was not memoized (it
> goes through `pcase' but pcase's memoization fails in that case).
> I added explicit memoization to pcase-let, which should
> help significantly.
> 
> Please try it and tell me if it was the only source of slowdown.

Unfortunately, I see no improvement at all, with trunk revision
108559: I still get the same 16.5 sec compiling org.el.

Thanks.