RFR: 8272773: Configurable card table card size [v9]

[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 one additional commit since the last revision:

  Changes to address @albertnetymk comments

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5838/files
  - new: https://git.openjdk.java.net/jdk/pull/5838/files/6d7b0844..a3551a0e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5838&range=08
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5838&range=07-08

  Stats: 8 lines in 4 files changed: 4 ins; 3 del; 1 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