RFR: 8141149 - [jittester] create Visitor for generating bytecode

[dmitrij pochepko]

Hi,

please review cumulative fix for 8141149 - ‘[jittester] create Visitor 
for generating bytecode’ and 8149463 - ‘[jittester] rarely generates 
tests with compile error’.

8141149 is a massive update introducing new functionality - direct 
bytecode generation. A special ByteCodeVisitor was created and a number 
of common classes were changed to support ByteCodeVisitor. These changes 
also affects java code generation part because of changes in common 
part. the changeset also includes a bug fix for 8149463 which caused 
incorrectly generated IR.

webrev: http://cr.openjdk.java.net/~dpochepk/8141149/webrev.01/
CRs: https://bugs.openjdk.java.net/browse/JDK-8141149
https://bugs.openjdk.java.net/browse/JDK-8149463

Thanks,
Dmitrij