Initial support of Geometry shaders (#1244)

* video_core: initial GS support

* fix for components mapping; missing prim type

src/shader_recompiler/ir/microinstruction.cpp

@@ -89,6 +89,8 @@ bool Inst::MayHaveSideEffects() const noexcept {
     case Opcode::ImageAtomicOr32:
     case Opcode::ImageAtomicXor32:
     case Opcode::ImageAtomicExchange32:
+    case Opcode::EmitVertex:
+    case Opcode::EmitPrimitive:
         return true;
     default:
         return false;