* Replace HBWMALLOC API with more general MEMKIND API, new functions
and variables added.
* Have libmemkind.so loaded when accessible.
* Redirect memspaces to default one except for high bandwidth which
is processed separately.
* Ignore some allocator traits e.g., sync_hint, access, pinned, while
others are processed normally e.g., alignment, pool_size, fallback,
fb_data, partition.
* Add tests for memory management
Patch by Andrey Churbanov
Differential Revision: https://reviews.llvm.org/D59783
llvm-svn: 357929
ebf1830bb1