[jdk15u-dev] RFR: 8259651: [macOS] Replace JNF_COCOA_ENTER/EXIT macros

[Vladimir Kempik]

Part 5/8 of JNF removal patches, applies almost cleanly, only slight context code difference in one place

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Commit messages:
 - Backport 5855d52a2a670a49b7a968fd58404b5d1836a8e1

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/11/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=11&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259651
  Stats: 600 lines in 48 files changed: 56 ins; 17 del; 527 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/11.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/11/head:pull/11

PR: https://git.openjdk.java.net/jdk15u-dev/pull/11