RFR: 8302152: Speed up compiler/loopopts/TestInfLoopNearUsePlacement.java

[Emanuel Peter]

>From over `5 sec` to about `0.8 sec`.

I simply reduced the `Thread.sleep`.

I verified that the same compilations still happen.

~/Documents/jtreg/bin/jtreg -va -s -jdk:/home/emanuel/Documents/fork5-jdk/build/linux-x64-debug/jdk/ -javaoptions:"-XX:CompileCommand=printcompilation,compiler.loopopts.TestInfLoopNearUsePlacement::test" /home/emanuel/Documents/fork5-jdk/open/test/hotspot/jtreg/compiler/loopopts/TestInfLoopNearUsePlacement.java

    283   32 % !   3       compiler.loopopts.TestInfLoopNearUsePlacement::test @ 39 (61 bytes)
    284   33 % !   4       compiler.loopopts.TestInfLoopNearUsePlacement::test @ 39 (61 bytes)
    286   34   !   4       compiler.loopopts.TestInfLoopNearUsePlacement::test (61 bytes)


On the time measurement that I got initially reported, this test was flagged as especially long-running, with `17 sec`. There may well be another issue, but I hope this fix already does the trick. We will see this in a while once I get the new data.

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Commit messages:
 - 8302152: Speed up compiler/loopopts/TestInfLoopNearUsePlacement.java

Changes: https://git.openjdk.org/jdk/pull/12514/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12514&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302152
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12514.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12514/head:pull/12514

PR: https://git.openjdk.org/jdk/pull/12514