<i18n dev> [15] RFR: 8241082: Upgrade IANA Language Subtag Registry data to 03-16-2020 version

[naoto.sato at oracle.com]

Hello,

Please review the fix to the following issue:

https://bugs.openjdk.java.net/browse/JDK-8241082

The proposed changeset is located at:

http://cr.openjdk.java.net/~naoto/8241082/webrev.00/

It is simply updating the data file. Since there is no change in 
equivalency of language tags, no code change and test change was needed 
except for the data release date. Instead, I modified the equiv-map 
source code generator to explicitly specify the initial capacity for 
hash maps.

Naoto