hipMemPtrGetInfo was returning the error hipErrorInvalidValue if it
was called on a nullptr. However, this does not match the malloc
convention where a nullptr has size zero; for example,
malloc_usable_size() returns zero if called on a nullptr.
This commit changes hipMemPtrGetInfo to set the size to zero and
return hipSuccess when called with a nullptr. (This also fits with
hipMalloc and hipFree usage, since hipMalloc of size zero results in a
nullptr, and hipFree of a nullptr is successful.)
Migrated malloc related files under memory folder into catch2 framework
Change-Id: I5aa07fc8148bdf6bef135947091aaf1d3c54663b
[ROCm/hip-tests commit: 4287af6a2f]
JonathanLichtnerAMD
systems-assistant[bot]
Danylo Lytovchenko
dkrottap