The SPIR-V backend previously ran codegen single-threaded in the linker thread.
Now each codegen job creates an `Mir` like other self-hosted backends.
Other changes:
- Bring back `dedup_types.zig` and `prune_unused.zig` **ISel**s which were originaly
removed because codegen was single-threaded at that time and therefor had no use
- Clean up `BinaryModule.zig`
- Remove `checkLogicalPtrOperation` from `elemPtrOneLayerOnly` in `Sema.zig`.
Element access uses `OpAccessChain`, which works on all logical address spaces
without `VariablePointers`. the check is only needed for pointer arithmetic.
Reorganize how the binOp and genBinOp functions work.
I've spent quite a while here reading exactly through the spec and so many
tests are enabled because of several critical issues the old design had.
There are some regressions that will take a long time to figure out individually
so I will ignore them for now, and pray they get fixed by themselves. When
we're closer to 100% passing is when I will start diving into them one-by-one.
- implements `airSlice`, `airBitAnd`, `airBitOr`, `airShr`.
- got a basic design going for the `airErrorName` but for some reason it simply returns
empty bytes. will investigate further.
- only generating `.got.zig` entries when not compiling an object or shared library
- reduced the total amount of ops a mnemonic can have to 3, simplifying the logic
Ali Cheraghi