R600/SI: Prettier display of input modifiers
R600/SI: Fold fabs/fneg into src input modifier
R600/SI: Support for vector overloads of load_const
R600/SI: Add a SIBufferLoadMerger pass
R600/SI: Start working on a Scheduler for SI.
Revert "R600/SI: Start working on a Scheduler for SI."

This reverts commit 8dbaa399aea7756138112b4078f2670a7e52330d.
SLP: Add a TTI callback for intrinsics
R600/SI: Add support for new vector intrinsic related callbacks