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

Ryujinx.Graphics.Shader/CodeGen/Glsl/HelperFunctions/ShuffleUp.glsl

@@ -0,0 +1,8 @@
+float Helper_ShuffleUp(float x, uint index, uint mask)
+{
+    uint clamp = mask & 0x1fu;
+    uint segMask = (mask >> 8) & 0x1fu;
+    uint minThreadId = gl_SubGroupInvocationARB & segMask;
+    uint srcThreadId = gl_SubGroupInvocationARB - index;
+    return (srcThreadId >= minThreadId) ? readInvocationARB(x, srcThreadId) : x;
+}