RFR: 8282347: AARCH64: Untaken branch in has_negatives stub

[Claes Redestad]

Trivial(?) cleanup removing an untaken branch in the aarch64 has_negatives stub.

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Commit messages:
 - 8282347: AARCH64: Untaken branch in has_negatives stub

Changes: https://git.openjdk.java.net/jdk/pull/7611/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7611&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282347
  Stats: 5 lines in 1 file changed: 0 ins; 4 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7611.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7611/head:pull/7611

PR: https://git.openjdk.java.net/jdk/pull/7611