RFR: 8324213: C1: There is no need for Canonicalizer to handle IfOp [v3]

[Denghui Dong]

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

Denghui Dong has updated the pull request incrementally with two additional commits since the last revision:

 - typo
 - add comment

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17499/files
  - new: https://git.openjdk.org/jdk/pull/17499/files/e156cd0c..d7ceda32

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17499&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17499&range=01-02

  Stats: 4 lines in 1 file changed: 4 ins; 0 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