Implement CAL and RET shader instructions (#1618)

* Add support for CAL and RET shader instructions

* Remove unused stuff

* Fix a bug that could cause the wrong values to be passed to a function

* Avoid repopulating function id dictionary every time

* PR feedback

* Fix vertex shader A/B merge

Ryujinx.Graphics.Shader/IntermediateRepresentation/Instruction.cs

@@ -31,6 +31,8 @@ namespace Ryujinx.Graphics.Shader.IntermediateRepresentation
         Branch,
         BranchIfFalse,
         BranchIfTrue,
+        Call,
+        CallOutArgument,
         Ceiling,
         Clamp,
         ClampU32,