RFR: 8324213: C1: There is no need for Canonicalizer to handle IfOp

[Denghui Dong]

IfOp will not be created when building the graph, so there is no need for Canonicalizer to handle IfOp.

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Commit messages:
 - 8324213: C1: There is no need for Canonicalizer to handle IfOp

Changes: https://git.openjdk.org/jdk/pull/17499/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17499&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324213
  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17499.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17499/head:pull/17499

PR: https://git.openjdk.org/jdk/pull/17499