GitLab

Removed a special case in the parser for FuncRefV constants, which
required every SSA variable to have a known type. This required
BundleParser to be rearranged to parse everything else before function
bodies, making functions available to functions defined above them
(something the spec requires, so that's progress!)

Also added support for COMMINST in the parser.

The new symbolic computation system finally works! Factorial runs again, albeit
slower than before. Load/Store isn't working yet, but only because global cells
aren't preallocated.

Because the Mu spec says that newly-allocated memory locations are zeroed out,
option values for unallocated spaces in data structures have been removed, and
newly-allocated values are filled with 0/NULL.