More Shader Gen Stuff

Mostly copied from GLSL since in terms of syntax within blocks they’re pretty similar. Likely the result will need tweaking…

Isn’t that conveniant?

“Do the simd_shuffle”

atomics

Remaining instructions

Remove removed special instructions

Getting somewhere…

src/Ryujinx.Graphics.Shader/CodeGen/Msl/HelperFunctions/HelperFunctionNames.cs

@@ -0,0 +1,7 @@
+namespace Ryujinx.Graphics.Shader.CodeGen.Msl
+{
+    static class HelperFunctionNames
+    {
+        public static string SwizzleAdd = "helperSwizzleAdd";
+    }
+}