RFR: 8338844: C2: remove useless code in PhaseIdealLoop::place_outside_loop() after 8335709

[Roland Westrelin]

This removes code that shouldn't be necessary now that the
NeverBranch/CProj nodes are assigned the correct loop. I proposed this
initially as part of https://github.com/openjdk/jdk/pull/20334 where
the recommendation was to take care of it separately to make
backports easier.

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Commit messages:
 - fix

Changes: https://git.openjdk.org/jdk/pull/20678/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20678&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8338844
  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20678.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20678/head:pull/20678

PR: https://git.openjdk.org/jdk/pull/20678