Instead of searching for a live interval pair, search for a location. This gives
a very modest speedup of .3 seconds compiling 176.gcc (out of 20s).

llvm-svn: 15136

Pull the LiveRange and LiveInterval classes out of LiveIntervals.h (which
will soon be renamed) into their own file. The new file should not emit
DEBUG output or have other side effects. The LiveIn

Pull the LiveRange and LiveInterval classes out of LiveIntervals.h (which
will soon be renamed) into their own file. The new file should not emit
DEBUG output or have other side effects. The LiveInterval class also now
doesn't know whether its working on registers or some other thing.

In the future we will want to use the LiveInterval class and friends to do
stack packing. In addition to a code simplification, this will allow us to
do it more easily.

llvm-svn: 15134

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