RFR: 8263989: Cleanup in EA

[Vladimir Kozlov]

Cleanup/refactoring changes suggested by @iwanowww in Escape Analysis code and few more.

 - fix typos
 - fix code style
 - few renaming
 - small refactoring

Tested tier1-3

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Commit messages:
 - 8263989: Cleanup in EA

Changes: https://git.openjdk.java.net/jdk/pull/3156/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3156&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263989
  Stats: 272 lines in 5 files changed: 81 ins; 24 del; 167 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3156.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3156/head:pull/3156

PR: https://git.openjdk.java.net/jdk/pull/3156