Ensure that allocations in 4GB heap have non 0 GPU address to patch.

- That address is used later to deduce that allocation is non null
- If we have address 0 it is incorrectly detected as null ptr on the GPU.

Change-Id: I45e1bb31f1788528327da35bfdcc13f3fa6beec2

Author: MichalMrozek

runtime/os_interface/windows/wddm/wddm.cpp

@@ -349,7 +349,7 @@ bool Wddm::mapGpuVirtualAddressImpl(Gmm *gmm, D3DKMT_HANDLE handle, void *cpuPtr
         }
 
         if (allocation32bit) {
-            MapGPUVA.MinimumAddress = gfxPartition.Heap32[3].Base;
+            MapGPUVA.MinimumAddress = gfxPartition.Heap32[3].Base + MemoryConstants::pageSize;
             MapGPUVA.MaximumAddress = gfxPartition.Heap32[3].Limit;
             MapGPUVA.BaseAddress = 0;
         }

unit_tests/os_interface/windows/wddm_memory_manager_tests.cpp

@@ -706,6 +706,14 @@ TEST_F(WddmMemoryManagerTest, Allocate32BitMemoryWithNullptr) {
     memoryManager->freeGraphicsMemory(gpuAllocation);
 }
 
+TEST_F(WddmMemoryManagerTest, given32BitAllocationWhenItIsCreatedThenItHasNonZeroGpuAddressToPatch) {
+    auto *gpuAllocation = memoryManager->allocate32BitGraphicsMemory(3 * MemoryConstants::pageSize, nullptr, AllocationOrigin::EXTERNAL_ALLOCATION);
+
+    ASSERT_NE(nullptr, gpuAllocation);
+    EXPECT_NE(0llu, gpuAllocation->getGpuAddressToPatch());
+    memoryManager->freeGraphicsMemory(gpuAllocation);
+}
+
 TEST_F(WddmMemoryManagerTest, Allocate32BitMemoryWithMisalignedHostPtrDoesNotDoTripleAlloc) {
     size_t misalignedSize = 0x2500;
     void *misalignedPtr = reinterpret_cast<void *>(0x12500);