[PATCH] SelectionDAG: Share ISD::MUL lowering code between the SelectionDAGLegalize and DAGTypeLegalizer

[Tom Stellard]

Hi,

The attached patches allow the SelectionDAGLegalizer to reuse ISD:MUL
lowering code from the DAGTypeLegalizer.

The first patch moves the DAGTypeLegalizer ISD:MUL lowering code into a public
SelectionDAG function called expandMUL() and the second patch modifies
the SelectionDAGLegalizer to use this code.

I think there may be other opportunities to share code between these two classes,
so I'm wondering if the approach I've taken would work for other operations too.
I'm interested in hearing what other people think.

-Tom
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