Added @ and ^ operators

I have just added.

begin
pinteger:=@mr.c;
a:=pinteger^;
mr.c:=@a^;
end

=>

.entrypoint
ldsflda valuetype Myrecord mr
ldflda int32 Myrecord::c
stsfld int32* pinteger
ldsfld int32* pinteger
ldobj int32
stsfld int32 a
ldsflda valuetype Myrecord mr
ldsflda int32 a
ldobj int32
stfld int32 Myrecord::c
ret