[cmucl-imp] Snapshot 2012-08

[Raymond Toy]

Just in time for the Olympics, the August snapshot has been tagged. 
Binaries will be uploaded soon.

The main changes for this snapshot are:

o full support for compiling cmucl with clang[1], and Mac OS X 10.7
(Lion) can build cmucl without problems.
o Updated ASDF
o Some cleanups in allocation which simplified the allocation.

This snapshot requires a cross-compile on x86 due to the allocation
changes.  Use src/bootfiles/20c/boot-2010-07-1-cross-x86.lisp as the
cross-compile script.

Ray

[1] The problem with clang was that the C allocation routines did not
save the xmm registers so that under certain conditions the C code would
trash a live xmm register, producing totally bogus results.