RFR: 8229797: [JVMCI] Clean up no longer used JVMCI::dependencies_invalid value.

[dean.long at oracle.com]

Looks good.

dl

On 8/27/19 7:25 PM, Xiaohong Gong (Arm Technology China) wrote:
> Hi,
>
>    Please help to review this jvmci patch:
>    Webrew: http://cr.openjdk.java.net/~pli/rfr/8229797/webrev.00/
>    JBS: https://bugs.openjdk.java.net/browse/JDK-8229797
>
>    This patch fix issue: https://github.com/oracle/graal/issues/1587.
>    The loading of new classes can cause dependencies to become false, which requires the dependent
> nmethods to be discarded and deoptimized. So if validating dependencies fails, it should make the
> result to be JVMCI::dependencies_failed, which makes jvmci throw the BailoutException.
>    The invalid dependencies happen at the time of installation without any intervening modification of
> the system dictionary. So as the system dictionary modification optimization has been removed, the
> compiler can not know whether the failed dependencies are triggered by class reloading or not. It's
> better to use dependencies_failed to mark the result.
>
> Thanks,
> Xiaohong Gong