public Insn withSourceLiteral() {
    return this;
  }
Returns an instance that is just like this one, except that, if possible, the insn is converted
into a version in which a source (if it is a constant) is represented directly rather than as a
register reference. {@code this} is returned in cases where the translation is not possible.

@return {@code non-null;} an appropriately-constructed instance
android/android_framework/dex-maker/src/main/java/com/android/dx/rop/code/Insn.java