* add restrict qualifier for clang backend convolution inputs/ outputs
see https://godbolt.org/z/Tb9jMxWfx for generated assembly
* enable more checks
* inline fmax to motivate the compiler to inline some more
* fix if else binding power
* start clang backend
* mostly working
* no group for reduce w clang
* it compiles
* compiles
* a11y
* minor fixups
* formatting
* add a test
* rename test