SWDEV-497841 - Add virtual memory heap

Add initial implementation of virtual memory heap with
dynamic virtual memory mapping support for memory pools.
DEBUG_HIP_MEM_POOL_VMHEAP controls the new method.

Change-Id: I8dc5be2e0f34ab472f1800f43bb6243639a5e500


[ROCm/clr commit: 296dce5570]

projects/clr/hipamd/src/hip_device.cpp

@@ -315,7 +315,7 @@ bool Device::existsActiveStreamForDevice() {
 
 // ================================================================================================
 Device::~Device() {
-  if (default_mem_pool_ != nullptr) {
+  if ((IS_LINUX || !DEBUG_HIP_MEM_POOL_VMHEAP) && (default_mem_pool_ != nullptr)) {
     default_mem_pool_->release();
   }