RFR: 8272773: Investigate making card table size configurable [v5]

[Vishal Chand]

> Hi,
> 
> Please review the changes to make CardTable entry size configurable. The changes primarily consists of:
> 
> 1. Addition of a cmdline flag **GCCardSizeInBytes** to make the card size startup time configurable.
> 2. Setting the card size based on the flag in G1, Parallel and Serial GC memory initialization paths.
> 3. Setting BlockOffsetTable size and ObjectStartArray size based on the card size.

Vishal Chand has updated the pull request incrementally with three additional commits since the last revision:

 - Remove G1 region size and card size dependency
 - Merge branch 'card-size-configurable' of https://github.com/vish-chan/jdk into card-size-configurable
 - Merge branch 'master' of https://github.com/vish-chan/jdk into card-size-configurable

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5838/files
  - new: https://git.openjdk.java.net/jdk/pull/5838/files/9d02c66b..1f0612a1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5838&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5838&range=03-04

  Stats: 38 lines in 8 files changed: 1 ins; 23 del; 14 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5838.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5838/head:pull/5838

PR: https://git.openjdk.java.net/jdk/pull/5838