public String getInlineString() {
    return null;
  }
Gets an "inline" string portion for toHuman(), if available. This is the portion that appears
after the Rop opcode

@return {@code null-ok;} if non-null, the inline text for toHuman()
android/android_framework/dex-maker/src/main/java/com/android/dx/rop/code/Insn.java