[llvm] [libsycl] USM Aligned allocation functions (PR #213468)

[via llvm-commits]

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@@ -40,24 +40,28 @@ _LIBSYCL_EXPORT void *malloc_device(std::size_t numBytes,
                                     const context &syclContext,
                                     const property_list &propList = {});
 
+/// Forward declaration of aligned_alloc_device for use in malloc_device.
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Robertkq wrote:

The comment was to get reviews if forward declaration is preferable, but I went ahead and just declared the `aligned_*` version of the functions before the non-aligned ones, as such, no forward declarations are needed anymore, I hope it's ok like this but I can modify it if needed

https://github.com/llvm/llvm-project/pull/213468