Add SR_WScaleFactorXY/SR_WScaleFactorZ stubs for Prince of Persia (#5)

Pulled in and cleaned up from Sudachi

Reviewed-on: http://y2nlvhmmk5jnsvechppxnbyzmmv3vbl7dvzn6ltwcdbpgxixp3clkgqd.onion/darktux/torzu/pulls/5
Co-authored-by: darktux <darktux@y2nlvhmmk5jnsvechppxnbyzmmv3vbl7dvzn6ltwcdbpgxixp3clkgqd.onion>
Co-committed-by: darktux <darktux@y2nlvhmmk5jnsvechppxnbyzmmv3vbl7dvzn6ltwcdbpgxixp3clkgqd.onion>

src/shader_recompiler/frontend/ir/ir_emitter.cpp

@@ -382,6 +382,14 @@ U1 IREmitter::IsHelperInvocation() {
     return Inst<U1>(Opcode::IsHelperInvocation);
 }
 
+U32 IREmitter::SR_WScaleFactorXY() {
+    return Inst<U32>(Opcode::SR_WScaleFactorXY);
+}
+
+U32 IREmitter::SR_WScaleFactorZ() {
+    return Inst<U32>(Opcode::SR_WScaleFactorZ);
+}
+
 F32 IREmitter::YDirection() {
     return Inst<F32>(Opcode::YDirection);
 }