[java/cs] Unit tests now run correctly with -dce no
- fixed co/contra-variance overrides
- fixed late Codegen.get_underlying_type application
- java Int64-related errors (precision loss)


git-svn-id: http://haxe.googlecode.com/svn/trunk@6403 f16182fa-f095-11de-8f43-4547254af6c6
[cs] no-root will only affect haxe-generated classes. Fixed issue #1639


git-svn-id: http://haxe.googlecode.com/svn/trunk@6404 f16182fa-f095-11de-8f43-4547254af6c6
[java/cs] "never" accessor will not generate getter/setter code anymore. Fixed issue #1638


git-svn-id: http://haxe.googlecode.com/svn/trunk@6405 f16182fa-f095-11de-8f43-4547254af6c6