[openmp] [test] Fix data structure mismatches for tests that define kmp_depend_info

Use the correct data type for pointer sized integers on Windows;
"long" is always 32 bit, even on 64 bit Windows - don't use it
for the kmp_intptr_t type.

Provide the exact correct definition of the kmp_depend_info
struct - avoid the risk of mismatches (if a platform would pack
things slightly differently when things are declared differently).

Zero initialize the whole dep_info struct before filling it in;
if only setting the in/out bits, the rest of the unallocated bits
in the bitfield can have undefined values. Libomp reads the flags
in combined form as an kmp_uint8 by reading the flag field - thus,
the unused bits do need to be zeroed. (Alternatively, the flag field
could be set to zero before setting the individual bits in the
bitfield).

Use kmp_intptr_t instead of long for casting pointers to integers.

Differential Revision: https://reviews.llvm.org/D137748