SWDEV-322620 - Virtual Memory Management

Implement virtualFree for PAL

Change-Id: I4482777fa52c979d42a7c57103862e2e02279024

rocclr/device/pal/paldevice.cpp

@@ -2262,6 +2262,11 @@ void* Device::virtualAlloc(void* addr, size_t size, size_t alignment)
 
 void Device::virtualFree(void* addr)
 {
+  amd::Memory* svmMem = amd::MemObjMap::FindMemObj(addr);
+  if (nullptr != svmMem && (svmMem->getMemFlags() & CL_MEM_VA_RANGE_AMD)) {
+    svmMem->release();
+    amd::MemObjMap::RemoveMemObj(addr);
+  }
 }
 
 void Device::virtualMap(void* addr, amd::Memory& mem, size_t size)