RFR: 8251462: Remove legacy compilation policy [v5]

[Aleksey Shipilev]

On Wed, 27 Jan 2021 16:43:28 GMT, Igor Veresov <iveresov at openjdk.org> wrote:

>> I asked Eric to run the benchmarks. The results should be ready on Wednesday.
>
> The benchmarking is done. No regressions. There are mild improvements in startup benchmarks on the order of 1-5% (I suspect because of the compilation policy devirtualization).
> 
> @dholmes-ora, do still plan to look at this? It's been a few weeks, I'd like to push this.

Please update from current master to get x86_32 built and tested in GH Actions.

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PR: https://git.openjdk.java.net/jdk/pull/1985