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

Ryujinx.Graphics.Shader/Decoders/OpCodeBranch.cs

@@ -6,9 +6,13 @@ namespace Ryujinx.Graphics.Shader.Decoders
     {
         public int Offset { get; }
 
+        public bool PushTarget { get; protected set; }
+
         public OpCodeBranch(InstEmitter emitter, ulong address, long opCode) : base(emitter, address, opCode)
         {
             Offset = ((int)(opCode >> 20) << 8) >> 8;
+
+            PushTarget = false;
         }
 
         public ulong GetAbsoluteAddress()