RFR: 8257398: Enhance debug output in Type::check_symmetrical

[Tobias Hartmann]

When working on C2 typesystem changes for project Valhalla, I got annoyed by always having to add debug information for the "meet not commutative" failure in `Type::check_symmetrical`. We should add output similar to the "meet not symmetric" case.

Thanks,
Tobias

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Commit messages:
 - 8257398: Enhance debug output in Type::check_symmetrical

Changes: https://git.openjdk.java.net/jdk/pull/1513/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1513&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257398
  Stats: 14 lines in 1 file changed: 8 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1513.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1513/head:pull/1513

PR: https://git.openjdk.java.net/jdk/pull/1513