[jdk16] RFR: 8258647: TestCharVect2 is very slow

[Nils Eliasson]

This is fixes compiler/codegen/TestCharVect2.java that suffers from the same problems as the tests fixed in JDK-8258225.

With the fix the test is fast enough to run with c1 only - so I removed the @requires attribute.

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Commit messages:
 - Exclude test-method

Changes: https://git.openjdk.java.net/jdk16/pull/46/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16&pr=46&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258647
  Stats: 12 lines in 1 file changed: 0 ins; 8 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk16/pull/46.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16 pull/46/head:pull/46

PR: https://git.openjdk.java.net/jdk16/pull/46