RFR (S): 8153852: [jittester] move TypeUtil to utils package

[Pavel Punegov]

Hi,

please review the following change to JITtester:
- rewrite TypeUtil and move to utils package
- add javadoc for each method in the class

bug: https://bugs.openjdk.java.net/browse/JDK-8153852
 <http://cr.openjdk.java.net/~ppunegov/8153852/webrev.00/>webrev: http://cr.openjdk.java.net/~ppunegov/8153852/webrev.00/ <http://cr.openjdk.java.net/~ppunegov/8153852/webrev.00/>
— Thanks,
Pavel Punegov

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