RFR: 8270901: Typo PHASE_CPP in CompilerPhaseType

[Yi Yang]

Should be PHASE_CCP instead of PHASE_CPP, it also affects dumped ideal graph XML.

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Commit messages:
 - typo

Changes: https://git.openjdk.java.net/jdk/pull/4917/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4917&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8270901
  Stats: 4 lines in 3 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4917.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4917/head:pull/4917

PR: https://git.openjdk.java.net/jdk/pull/4917