[patch] x86_64-darwin configury support

[Eric Christopher <echristo at apple dot com>]

Here's a patch to add an x86_64-darwin target to gcc. Tested by  
bootstrap and cross test. Some caveats:

a) we don't actually compare for bootstrap right now. one comparison  
failure in gcc.o. this is an ld64 problem I believe. I'm looking into  
it.
b) cross building is hard because x86_64-darwin-as/ld/... aren't  
installed on the system. I use a script to get around this.

The easiest way to deal with this is to disable bootstrap and build  
host and target x86_64-darwin for now. With that configuration, make  
check has no regressions over x86-darwin with the m64 multilib.

OK?

-eric

2006-11-06  Eric Christopher  <echristo@apple.com>

	* config.gcc: Add x86_64-darwin host support.
	* config.host: Ditto.
	* config/i386/darwin64.h: New file.
	* config/i386/t-darwin64: Ditto.

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