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  1. JDK
  2. JDK-8302139

Speed up SuperWord reduction tests

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      https://github.com/openjdk/jdk/blame/master/test/hotspot/jtreg/compiler/loopopts/superword/SumRed_Double.java
      https://github.com/openjdk/jdk/blame/master/test/hotspot/jtreg/compiler/loopopts/superword/SumRedSqrt_Double.java

      These are two of the slowest compiler tests in tier1, take about 30 and 25sec.

      Restrict compilation, see if compile threashold is ok. Consider merging the two tests.

      Similar issue in JDK-8302093. We should just speed up all of the reduction tests of superword.
      Currently, [~dskantz] is working on JDK-8294715. Afterwards we can speed these tests up. Maybe we have to unify all into a single test-file.

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              epeter Emanuel Peter
              epeter Emanuel Peter
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