RFR: 8257805: Add compiler/blackhole tests to tier1

[Aleksey Shipilev]

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.

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Commit messages:
 - Merge branch 'master' into JDK-8257805-bh-tier1
 - 8257805: Add compiler/blackhole tests to tier1

Changes: https://git.openjdk.java.net/jdk/pull/1654/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1654&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257805
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1654.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1654/head:pull/1654

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