[lworld] RFR: jdk-8249555 Rename valueArray* source files to flatArray*

[Harold Seigel]

Please review this change which renames the appropriate hotspot runtime source files, methods, fields, etc. from
"valueArray*" to "flatArray*".  The change does not rename any gc or jit source files.

The change was tested with tiers 1 and 2 on Windows, Mac, and Linux x64, and tiers 3-5 on Linux x64.

Thanks! Harold

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Commit messages:
 - jdk-8249555 Rename valueArray* source files to flatArray*

Changes: https://git.openjdk.java.net/valhalla/pull/115/files
 Webrev: https://webrevs.openjdk.java.net/valhalla/115/webrev.00
  Stats: 2178 lines in 67 files changed: 1000 ins; 1001 del; 177 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/115.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/115/head:pull/115

PR: https://git.openjdk.java.net/valhalla/pull/115