RFR: 8257805: Add compiler/blackhole tests to tier1

[Aleksey Shipilev]

On Mon, 7 Dec 2020 19:21:24 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> JDK-8252505 added new tests. They are short, and were supposed to run in tier1. Unfortunately, they are in `compiler/blackhole` directory, not in `compiler/c1` or `compiler/c2`, which would get them included into tier1 automatically. So, we need to include them to tier1 directly.
>
> It is reasonable. It adds 21 tests and about 1 min  to tier1_compiler_1 which currently takes less time than tier1_compiler_2 and tier1_compiler_3.

Thank you!

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PR: https://git.openjdk.java.net/jdk/pull/1654