RFR(XS) 8231278 Rename FileMapHeader::_read_only_tables_start to _serialized_data_start

[Calvin Cheung]

Looks good.

thanks,

Calvin

On 9/20/19 9:49 AM, Ioi Lam wrote:
> https://bugs.openjdk.java.net/browse/JDK-8231278
> http://cr.openjdk.java.net/~iklam/jdk14/8231278-rename-read_only_tables_start.v01/ 
>
>
> The name _read_only_tables_start is ambiguous, as there are multiple 
> read-only
> tables in the CDS archive. It should be renamed to 
> _serialized_data_start,
> as that where the data is accessed by 
> {ReadClosure,WriteClosure}::serialize.
>
> Thanks
> - Ioi