[Openmp-commits] [openmp] [OpenMP] [test] Skip the -mlong-double-80 test on MSVC ABI (PR #81115)

[Joseph Huber via Openmp-commits]

jhuber6 wrote:

Might be better to check for 64-bit doubles in general since that's present on various targets. But probably not a huge deal overall.

This should do it
```c
#include <float.h>
#if (LDBL_MANT_DIG == 53)
// 64-bit double
#elif (LDBL_MANT_DIG == 64)
// 80-bit double
#else
// 128-bit double
#endif
```

https://github.com/llvm/llvm-project/pull/81115