Add host lib

[pfultz2]

This adds the host lib which can generate instances and can be used for runtime compilation.

[junliume]

@JehandadKhan could you help to review this? And maybe ask @atamazov

[JehandadKhan]

@pfultz2 I am unable to run the tests in the host directory
Here is what I get

# make check
[ 96%] Built target embed_lib_ck_headers
[ 98%] Built target ck_host
[ 99%] Built target ck_rtc
[ 99%] Building CXX object test/CMakeFiles/test_host_gemm_multiple_d.dir/gemm_multiple_d.cpp.o
/data/repos/composable_kernel/host/test/gemm_multiple_d.cpp:115:64: error: call to 'isnan' is ambiguous
        if(std::any_of(x.begin(), x.end(), [](auto y) { return std::isnan(y); }))
                                                               ^~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/predefined_ops.h:283:16: note: in instantiation of function template specialization 'check_all<_Float16>::operator()(const rtc::buffer<_Float16> &)::(anonymous class)::operator()<_Float16>' requested here
        { return bool(_M_pred(*__it)); }
                      ^
/usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_algo.h:120:8: note: in instantiation of function template specialization '__gnu_cxx::__ops::_Iter_pred<(lambda at /data/repos/composable_kernel/host/test/gemm_multiple_d.cpp:115:44)>::operator()<const _Float16 *>' requested here
          if (__pred(__first))
              ^
/usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_algo.h:161:14: note: in instantiation of function template specialization 'std::__find_if<const _Float16 *, __gnu_cxx::__ops::_Iter_pred<(lambda at /data/repos/composable_kernel/host/test/gemm_multiple_d.cpp:115:44)>>' requested here
      return __find_if(__first, __last, __pred,
             ^
/usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_algo.h:3969:19: note: in instantiation of function template specialization 'std::__find_if<const _Float16 *, __gnu_cxx::__ops::_Iter_pred<(lambda at /data/repos/composable_kernel/host/test/gemm_multiple_d.cpp:115:44)>>' requested here
      return std::__find_if(__first, __last,
                  ^
/usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_algo.h:526:40: note: in instantiation of function template specialization 'std::find_if<const _Float16 *, (lambda at /data/repos/composable_kernel/host/test/gemm_multiple_d.cpp:115:44)>' requested here
    { return __last == _GLIBCXX_STD_A::find_if(__first, __last, __pred); }
                                       ^
/usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stl_algo.h:544:20: note: in instantiation of function template specialization 'std::none_of<const _Float16 *, (lambda at /data/repos/composable_kernel/host/test/gemm_multiple_d.cpp:115:44)>' requested here
    { return !std::none_of(__first, __last, __pred); }
                   ^
/data/repos/composable_kernel/host/test/gemm_multiple_d.cpp:115:17: note: in instantiation of function template specialization 'std::any_of<const _Float16 *, (lambda at /data/repos/composable_kernel/host/test/gemm_multiple_d.cpp:115:44)>' requested here
        if(std::any_of(x.begin(), x.end(), [](auto y) { return std::isnan(y); }))
                ^
/data/repos/composable_kernel/host/test/gemm_multiple_d.cpp:181:37: note: in instantiation of member function 'check_all<_Float16>::operator()' requested here
        CHECK(report(solution, check(rtc::from_gpu(c))));
                                    ^
/opt/rocm-5.7.0/llvm/lib/clang/17.0.0/include/__clang_cuda_math_forward_declares.h:110:17: note: candidate function
__DEVICE__ bool isnan(double);
                ^
/opt/rocm-5.7.0/llvm/lib/clang/17.0.0/include/__clang_cuda_math_forward_declares.h:111:17: note: candidate function
__DEVICE__ bool isnan(float);
                ^
1 error generated when compiling for gfx90a.
make[3]: *** [test/CMakeFiles/test_host_gemm_multiple_d.dir/build.make:76: test/CMakeFiles/test_host_gemm_multiple_d.dir/gemm_multiple_d.cpp.o] Error 1
make[2]: *** [CMakeFiles/Makefile2:1009: test/CMakeFiles/test_host_gemm_multiple_d.dir/all] Error 2
make[1]: *** [CMakeFiles/Makefile2:885: CMakeFiles/check.dir/rule] Error 2
make: *** [Makefile:544: check] Error 2

If you can help test the branch as well as provide some example on how to run the driver that would be helpful as well

[pfultz2]

@JehandadKhan It should be fixed now.

[zjing14]

The PR looks good, but we have the following items to do:

1. We need to add CI for this PR @illsilin
2. We need a better name than "host", e.g., "codegen"

[illsilin]

Moved the code from "host" to "codegen" folder, synced with the develop branch, fixed the item pointed by Adam.
Waiting for Astha's suggestions what kind of tests we want to run in the CI.