Fixed parser bug wrt new and automatic semicolon insertion
- Changed heap/stack/link allocation to use NO_MOVE and NO_INTERIOR GC flags
- Fixed crash bug w.r.t loop labels
- Fixed bug w.r.t. new Array() and non-int arguments
- Fixed bug w.r.t. floating-point array indices
- Added INT64 type tag
- Renamed other tags and IR instructions for more consistency
- Still need to fix set_value and load_u64, store_u64
- Basic support for int64 type completed
- Made "make test" faster by reusing interpreter objects
- Started implementing function call inlining
- Progress on inlining code