RFR: 8286452: The array length of testSmallConstArray should be small and const

[Haomin]

testLargeVariableArray and testSmallConstArray are the same, the localArrlen of testSmallConstArray should be small and const.

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Commit messages:
 - 8286452: The array length of testSmallConstArray should be small and const

Changes: https://git.openjdk.java.net/jdk/pull/8621/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8621&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8286452
  Stats: 8 lines in 1 file changed: 1 ins; 0 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8621.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8621/head:pull/8621

PR: https://git.openjdk.java.net/jdk/pull/8621