public CstMethodRef getPolymorphicMethod() {
    return polymorphicMethod;
  }
Gets the method to be invoked. This will be will either be {@code
java.lang.invoke.MethodHandle.invoke()} or {@code java.lang.invoke.MethodHandle.invokeExact()}.

@return {@code non-null;} method reference to be invoked
android/android_framework/dex-maker/src/main/java/com/android/dx/rop/code/InvokePolymorphicInsn.java