Implement V_MOVREL variants (#745)

* shader_recompiler: Implement V_MOVRELS_B32, V_MOVRELD_B32,
V_MOVRELSD_B32

Generates a ton of OpSelects to hardcode reading or writing from each
possible vgpr depending on the value of m0

Future work is to do range analysis to put an upper bound on m0 and
check fewer registers.

* fix runtime info after rebase

src/shader_recompiler/runtime_info.h

@@ -107,6 +107,7 @@ struct RuntimeInfo {
     Stage stage;
     u32 num_user_data;
     u32 num_input_vgprs;
+    u32 num_allocated_vgprs;
     VertexRuntimeInfo vs_info;
     FragmentRuntimeInfo fs_info;
     ComputeRuntimeInfo cs_info;