Minor optimization: Skip call to vkUnmapMemory before vkFreeMemory for dedicated allocations, which is allowed by the spec.
Minor optimization: Skip call to vkUnmapMemory before vkFreeMemory for dedicated allocations, which is allowed by the spec.

GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator,GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator,GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator