CQ_Undefine

I changed the message and ended up making the lack of validation layer a non-critical failure. I wonder if it should remain obligatory as `VULKAN_DEBUG` would have to be explicitly...

> Which tests? At least the memory64/table64.wast on line 13 imports table64 from spectest. The imported web platform tests use the async_index.js file and the lack of this symbols causes...

> `location_handle` computation is very repetitive, could it be extracted to some (inline?) function instead? Looking at how it's already pretty minimal, different between some functions and the fact that...