RFR: 8283237: CallSite should be a sealed class [v3]

[Mandy Chung]

On Fri, 18 Mar 2022 22:12:10 GMT, liach <duke at openjdk.java.net> wrote:

>> Change `CallSite` to a sealed class, as `CallSite` is an abstract class which does not allow direct subclassing by users per its documentation. Since I don't have a JBS account, I posted the content for the CSR in a GitHub Gist at https://gist.github.com/150d5aa7f8b13a4deddf95969ad39d73 and wish someone can submit a CSR for me.
>
> liach has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove homemade callsite from test

I created CSR (https://bugs.openjdk.java.net/browse/JDK-8283530).  I took the liberty to adjust the CSR to include only the needed information.  Since I'm the RE for this CSR (you don't have JBS account), you will need another reviewer for this CSR.

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PR: https://git.openjdk.java.net/jdk/pull/7840