PATCH: R600/SI: Do abs/neg folding with ComplexPatterns

[Tom Stellard]

Hi,

The attached patches move the abs/neg folding for SI into
ISel using complex patterns.  The first patch adds a pass called
SIShrinkInstructions, which converts instructions from 64-bit to 32-bit
encodings.  The next 4 patches do some tablegen refactoring, then patches
6 and 7 actually move the abs/neg folding.

With these patches we now select to the 64-bit encoding for most instructions,
which is why the SIShrinkInstructions pass was added.  Also, some of the
integer VOP3 instructions no longer have the modifiers operands.

-Tom
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