[jdk11u-dev] RFR: 8273314: Add tier4 test groups

[Aleksey Shipilev]

On Wed, 6 Oct 2021 08:06:28 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Semi-clean backport to improve testing in 11u. There seemed to a little trailing whitespace in langtools TEST.groups, which broke the cleanliness. I resolved that by hand. Attn @RealCLanger ;)
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `jdk:tier4` passes with a few known testbugs

Thanks! Got the push approval as well.

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PR: https://git.openjdk.java.net/jdk11u-dev/pull/477