[LLVMdev] Linear scan is now the default register allocator

[Chris Lattner]

Hi everyone,

I just wanted to point out that the -linearscan allocator is now the
default register allocator for the target independent code generator.  I
believe that it is completely stable, and it generates code that is often
about 2x as fast as the naive local allocator.

If you run into any problems, please let us know.  Thanks to Alkis for
writing it, it's a great piece of work!

-Chris

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