Add workaround for Dwarf exception handling.
Add a set container.

This is a template set container with the same implementation as the
already existing associative array (aav.c).
First step of adding 64bit support.

This includes using the vtable optimization.
Add support for instance variables.
Disable vtable dispatch for Objective-C methods.
Properly output metadata for classes.
Properly output string literals.
Properly output protocols.
Add missing override.
Fix linker error in the tests.
Compile Objective-C code both for 32 and 64bit.
Output properties.
Fix protocols for 32bit.
Fix test runner.
Refactor Objective-C implementation to use virtual methods.
Tabs to spaces.
Remove explicit alignment from symbols.
Ivar offset symbols should be global.
Add properties to protocols.
Fix property type encoding.