RFR: 8267805: Add UseVtableBasedCHA to the list of JVM flags known to jtreg

[Aleksey Shipilev]

On Wed, 26 May 2021 17:24:55 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

> A trivial change to enable `vm.opt.final.UseVtableBasedCHA` usage in `@requires`. 
> 
> It was omitted in #3727 and `compiler/cha/StrengthReduceInterfaceCall` hasn't been executed since then. 
> 
> Testing:
> - [x] hs-tier1 - hs-tier4

Fine and trivial.

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Marked as reviewed by shade (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/4210