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TR11 introduced changes to support target memory management in a unified way by defining a series of API routines and additional traits. Host runtime is oblivious to how actual memory resources are mapped when using the new API routines, so it can only support how the composed memory space is maintained, and the offload backend must handle which memory resources are actually used to allocate memory from the memory space. Here is summary of the implementation. * Implemented 12 API routines to get/mainpulate memory space/allocator. * Memory space composed with a list of devices has a state with resource description, and runtime is responsible for maintaining the allocated memory space objects. * Defined interface with offload runtime to access memory resource list, and to redirect calls to omp_alloc/omp_free since it requires backend-specific information. * Value of omp_default_mem_space changed from 0 to 99, and omp_null_mem_space took the value 0 as defined in the language. * New allocator traits were introduced, but how to use them is up to the offload backend. * Added basic tests for the new API routines.
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