RFR: 8304693: Remove -XX:-UseVtableBasedCHA

[Vladimir Ivanov]

On Wed, 26 Jun 2024 17:47:57 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

> JDK-8266074 introduced new CHA implementation and a flag (-XX:-UseVtableBasedCHA) to switch back to the original implementation for diagnostic purposes. Vtable-based CHA implementation has been turned on by default since 17 and now the time has come to remove UseVtableBasedCHA flag.
> 
> Testing: hs-tier1 - hs-tier6

Thanks for the reviews, Vladimir, Coleen, and David.

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PR Comment: https://git.openjdk.org/jdk/pull/19911#issuecomment-2195414750