MSVC annoying totally redid their wave ops here:

https://github.com/Microsoft/DirectXShaderCompiler/wiki/Wave-Intrinsics

I've had to totally rework the existing wave ops to support this.

```
[----------] Global test environment tear-down
[==========] 1142 tests from 44 test cases ran. (186552 ms total)
[  PASSED  ] 1142 tests.
```