[lworld] RFR: JDK-8252061 [lword] Support Object::toString for inline type

[Srikanth Adayapalam]

On Thu, 20 Aug 2020 01:40:40 GMT, Mandy Chung <mchung at openjdk.org> wrote:

> This adds the `Object::toString` support for inline classes.  This will replace the need
> for javac to generate the `toString` method to call the bootstrap method.
> 
> JDK-8206077 will revisit the overlap of `ValueBootstrapMethods` and `ObjectMethods`.
> 
> This patch also removes the private `isSubstituable0` method and makes sure
> that `isSubstitutable` does not have `acmp` instruction and can be invoked by VM.

+1 for javac changes

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Marked as reviewed by sadayapalam (Committer).

PR: https://git.openjdk.java.net/valhalla/pull/155