RFR: 8255672: Replace PhaseTransform::eqv by pointer equality check [v2]

[Tobias Hartmann]

> `PhaseTransform::eqv(n1, n2)` can be replaced by `n1 == n2`. Code in adlc also refers to it but already uses `==` instead.
> 
> Thanks,
> Tobias

Tobias Hartmann has updated the pull request incrementally with one additional commit since the last revision:

  Added missing whitespace

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/999/files
  - new: https://git.openjdk.java.net/jdk/pull/999/files/ecfac16c..9731df02

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=999&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=999&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/999.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/999/head:pull/999

PR: https://git.openjdk.java.net/jdk/pull/999