RFR: 8134540: Much nearly duplicated code for PerfMemory support

Mon Jan 11 20:38:08 UTC 2021

Please review this change to merge the Unix-like PerfMemory_*.cpp source files into a single PerfMemory_posix.cpp source file.

The changes were tested on Mach5 tiers 1-5 on Linux, Windows, and Mac OS, and cross-builds were done for the S390, arm32, ppc, and x86 platforms.

Thanks, Harold

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Commit messages:
 - 8134540: Much nearly duplicated code for PerfMemory support

Changes: https://git.openjdk.java.net/jdk/pull/2037/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2037&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8134540
  Stats: 2650 lines in 7 files changed: 69 ins; 2559 del; 22 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2037.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2037/head:pull/2037

PR: https://git.openjdk.java.net/jdk/pull/2037