[mlir][spirv] Fix incorrect pointer usage in Vulkan buffer and Memref descriptor binding

[jackalcooper]

Summary

This should fix these issues:

• Vulkan runtime will produce incorrect result if there is alignment.
• There will be illegal memory access if binding a LLVM global materialized from a constant op (0xdeadbeef).

[antiagainst]

Thanks for fixing this!

mlir/tools/mlir-vulkan-runner/vulkan-runtime-wrappers.cpp

 };
 
 template <typename T, uint32_t S>
 void bindMemRef(void *vkRuntimeManager, DescriptorSetIndex setIndex,
                 BindingIndex bindIndex, MemRefDescriptor<T, S> *ptr) {
   uint32_t size = sizeof(T);
   for (unsigned i = 0; i < S; i++)
     size *= ptr->sizes[i];
-  VulkanHostMemoryBuffer memBuffer{ptr->allocated, size};
+  VulkanHostMemoryBuffer memBuffer{ptr->aligned, size};
   reinterpret_cast<VulkanRuntimeManager *>(vkRuntimeManager)
       ->setResourceData(setIndex, bindIndex, memBuffer);
 }
 
 extern "C" {
 /// Initializes `VulkanRuntimeManager` and returns a pointer to it.
 VULKAN_WRAPPER_SYMBOL_EXPORT void *initVulkan() {
   return new VulkanRuntimeManager();