new apple-ppc branch

[Mike Stump]

I've created an apple-ppc-branch for various work, including some 
development work for better code generation on the powerpc, but also 
may have other bits such as customizations of gcc for Apple customers 
or compile time improvements.  The branch will be used to foster gcc 
development between contributers.

Initially we plan on putting our most recent top of tree that we are 
using around here on the branch.

The base for the branch was the top of tree-ssa-20020619-branch on 
March 24th.

I've tagged the branch and have added it to the branch documentation.  
I'll be checking in our current work to it as soon as we do one more 
merge.

We'll use [apple-ppc] as the email tag.