Implement BFI, BRK, FLO, FSWZADD, PBK, SHFL and TXD shader instructions, misc. fixes

Ryujinx.Graphics.Shader/StructuredIr/HelperFunctionsMask.cs

@@ -0,0 +1,14 @@
+using System;
+
+namespace Ryujinx.Graphics.Shader.StructuredIr
+{
+    [Flags]
+    enum HelperFunctionsMask
+    {
+        Shuffle     = 1 << 0,
+        ShuffleDown = 1 << 1,
+        ShuffleUp   = 1 << 2,
+        ShuffleXor  = 1 << 3,
+        SwizzleAdd  = 1 << 4
+    }
+}