Fixing compile errors when compiling with clang++

[daniela-hase]

This PR fixes compile errors when compiling cuBQL with clang++.

Original error messages were:

cuBQL/builder/cuda/sah_builder.h:68:20: error: variable length arrays in C++ are a Clang extension [-Werror,-Wvla-cxx-extension]
   68 |       float rAreas[sah.numBins];

cuBQL/builder/cuda/radix.h:588:11: error: no matching function for call to 'min'
  588 |         ? min(buildConfig.makeLeafThreshold,buildConfig.maxAllowedLeafSize)

cuBQL/builder/cuda/builder_common.h:166:45: error: array index 3 is past the end of the array (that has type 'const typename int_type_of<scalar_t>::type[3]' (aka 'const int[3]')) [-Werror,-Warray-bounds]
  166 |                                   ?((dim>2)?lower[3]:lower[2])
      |                                             ^     ~

cuBQL/builder/cuda/builder_common.h:97:22: error: no matching function for call to '__float_as_int'
   97 |       int32_t bits = __float_as_int(f);
      |                      ^~~~~~~~~~~~~~

[iwald-nvidia]

Hey - sorry this took so long, for some reason i didn't get a notifcation on that.

Happy to merge this after CI runs through (assuming it will :-) ); but just a note: clang isn't in the CI yet; if you want to make sure that this gets tested going forward i'd be happy to take a PR on an updated CI script as well.

[daniela-hase]

No worries at all! :)

It looks like the CI failed due to this change: #if !defined(__CUDACC__) - I'll get that sorted out, sorry about that!

[iwald-nvidia]

BTW I think you can also manually start the CI in your own fork by clicking on "actions" tab. I always use this myself to check on the windows build - i develop under linux, then do a CI run to see if that still builds on windows before creating PR.