After the recent bunch of changes in alloc.c, etc., I'm getting a
mighty crash on Windows XP.

This is the trunk, updated a few minutes ago,
(dist|real|maintainer-)clean'ed and bootstrapped.

Compiled with gcc (GCC) 3.4.5 (mingw special), with no unusual
warnings (i.e., the same warnings that the previous successful
bootstrap).

I'm attaching the DrMingw log instead of including it in the text
because it's almost 99 KiB.

             Juanma