RFR: 8256478: C2 compilation fails with assert(t1->isa_long()) failed: Type must be a long

[Tobias Hartmann]

The `RotateLeftNode::Ideal` transformation added by [JDK-8254872](https://bugs.openjdk.java.net/browse/JDK-8254872) should ignore a TOP `in(1)` input which will then be handled by `RotateLeftNode::Value`.

Thanks,
Tobias

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Commit messages:
 - 8256478: C2 compilation fails with assert(t1->isa_long()) failed: Type must be a long

Changes: https://git.openjdk.java.net/jdk/pull/1260/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1260&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256478
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1260.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1260/head:pull/1260

PR: https://git.openjdk.java.net/jdk/pull/1260