RFR: 8258534: Epsilon: clean up unused includes

Thu Dec 17 02:09:01 UTC 2020

Hi all,

CLion IDE shows two warnings of unused includes(`#include "utilities/macros.hpp"`) in EpsilonGC's code. these maybe can be removed.

Testing: macosx-x86_64-server-{release,fastdebug,slowdebug}

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Commit messages:
 - Epsilon: clean up unused includes

Changes: https://git.openjdk.java.net/jdk/pull/1745/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1745&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258534
  Stats: 2 lines in 2 files changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1745.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1745/head:pull/1745

PR: https://git.openjdk.java.net/jdk/pull/1745