public DalvInsn getLowRegVersion() {
    RegisterSpecList regs = registers.withExpandedRegisters(0, hasResult(), null);
    return withRegisters(regs);
  }
Gets the instruction that is equivalent to this one, except that it uses sequential registers
starting at {@code 0} (storing the result, if any, in register {@code 0} as well).

@return {@code non-null;} the replacement
android/android_framework/dex-maker/src/main/java/com/android/dx/dex/code/DalvInsn.java