RFR: 8306872: Rename Node_Array::Size()

[Xin Liu]

Node_List inherits Node_Array, so it inherits Size(). To resolve naming conflict,
Node_List uses size() (with little s) and keep Size() as capacity. I don't think 
it's a good practice to distinct two function using capital initial. In particular
they have different meanings. A true story is that it took me 2 days to find a bug
that I chose wrong one between them.

This patch just renames Node_Array::Size to max. By using different names, this will
avoid from misusing. We need to changes 6 places. 4 are for Node_List::Size() intentionally.
2 of them are for Node_Array::Size().

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Commit messages:
 - 8306872: Rename Node_Array::Size()

Changes: https://git.openjdk.org/jdk/pull/13659/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13659&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306872
  Stats: 7 lines in 5 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/13659.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13659/head:pull/13659

PR: https://git.openjdk.org/jdk/pull/13659