Support &refvariable = value (to set the backing pointer of a ref). This is VERY occasionally very handy.
Emit a global variable even if its size is zero.
Unbreak Boehm with threading; store delta instead of pointer for 16-aligned prefix to make the GC's job a little easier
Fix a bug caused by allowing global non-extern-C functions to cast to delegates, then passing them to a different thread (where the tls pointer, haphazardly stored in the data field, would be wrong). Non-extern-C functions must now be explicitly converted to delegates with sys.toDg.
Support 0/1 literals on vectors for ints as well as floats
Don't emit AVX instructions; valgrind chokes on them.
slightly improve std.wren