RFR: 8256719: C1 flags that should have expired are still present

Mon Nov 23 07:11:55 UTC 2020

On Fri, 20 Nov 2020 08:25:59 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> [JDK-8235673](https://bugs.openjdk.java.net/browse/JDK-8235673) removed some flags from C1 and made them C2 only. They expired in JDK 16 and should simply be removed.
>> 
>> Thanks,
>> Tobias
>
> Looks fine.

@shipilev, @neliasso thanks for the reviews!

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PR: https://git.openjdk.java.net/jdk/pull/1338