[TableGen] Remove SinkPatternPredicates from the DAG isel matcher optimizer.
[TableGen] Remove SinkPatternPredicates from the DAG isel matcher optimizer.

Pattern predicates already appear to be emitted as far down as they can be. The optimization was making no changes on any in-tree target.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@268705 91177308-0d34-0410-b5e6-96231b3b80d8

GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm