[llvm] [offload] add handling of memory alignment to MemoryManagerTy (PR #218418)

[Jan Trusiłło via llvm-commits]

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311Volt wrote:

Referring to the bug I pointed out in https://github.com/llvm/llvm-project/pull/218418/changes#r3861863959 , I suggest:

```cpp
size_t MaxPaddedAllocSize = Size + Alignment - 1;
if(MaxPaddedAllocSize > SizeThreshold) {
 /* ... */
```

https://github.com/llvm/llvm-project/pull/218418