public static Rop opIfNe(TypeList types) {
    return pickIf(types, IF_NEZ_INT, IF_NEZ_OBJECT, IF_NE_INT, IF_NE_OBJECT);
  }
Returns the appropriate {@code if-ne} rop for the given sources. The result is a shared
instance.

@param types {@code non-null;} source types
@return {@code non-null;} an appropriate instance
android/android_framework/dex-maker/src/main/java/com/android/dx/rop/code/Rops.java