RFR: JDK-8277562 Remove dead method c1 If::swap_sux

[Ludvig Janiuk]

swap_sux in c1 is never used or referenced. Let's remove it. This will facilitate further refactorings.

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Commit messages:
 - Remove dead code swap_sux

Changes: https://git.openjdk.java.net/jdk/pull/6517/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6517&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277562
  Stats: 8 lines in 1 file changed: 0 ins; 8 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6517.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6517/head:pull/6517

PR: https://git.openjdk.java.net/jdk/pull/6517