[OpenMP][FIX] Add second include after header was split in d1705c1196
The math wrapper handling is going to be replaced shortly and
d1705c1196fedfe927716923ac121f1134924a36 was actually a precursor for
that.
diff --git a/clang/lib/Headers/openmp_wrappers/__clang_openmp_math_declares.h b/clang/lib/Headers/openmp_wrappers/__clang_openmp_math_declares.h
index a422c98..dd97fac 100644
--- a/clang/lib/Headers/openmp_wrappers/__clang_openmp_math_declares.h
+++ b/clang/lib/Headers/openmp_wrappers/__clang_openmp_math_declares.h
@@ -26,6 +26,7 @@
#include <__clang_cuda_libdevice_declares.h>
/// Provide definitions for these functions.
#include <__clang_cuda_device_functions.h>
+#include <__clang_cuda_math.h>
#undef __CUDA__
