The spirv spec generator now also generates some support information:
Opcode gains a function to query a Zig type representing the operands
of the opcode. The idea is that this will enable a richer interface for
emitting spirv instructions.
Conflicts:
* build.zig
* src/Compilation.zig
* src/codegen/spirv/spec.zig
* src/link/SpirV.zig
* test/stage2/darwin.zig
- this one might be problematic; start.zig looks for `main` in the
root source file, not `_main`. Not sure why there is an underscore
there in master branch.
