RFR: 8257561: Some code is not vectorized after 8251925

Thu Dec 3 00:59:01 UTC 2020

I noticed that some our tests are not vectorized since JDK 16 b24. I found it was caused by small RFE change [8250607](https://bugs.openjdk.java.net/browse/JDK-8250607) and incorrect code move in changes for [8251925](https://bugs.openjdk.java.net/browse/JDK-8251925).
I reverted those changes and got back all vectorized tests.

Tested: tier1-4, precheckin-comp, 100 runs of renaissance test (fixed by 8251925).

-------------

Commit messages:
 - 8257561: Some code is not vectorized after 8251925

Changes: https://git.openjdk.java.net/jdk/pull/1584/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1584&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257561
  Stats: 19 lines in 2 files changed: 6 ins; 10 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1584.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1584/head:pull/1584

PR: https://git.openjdk.java.net/jdk/pull/1584