[clang] [llvm] [Offloading] Extend OffloadBinary format to support multiple metadata entries (PR #169425)

[Joseph Huber via llvm-commits]

https://github.com/jhuber6 commented:

Basically, what I'm hoping here is that we just have the minimal changes to support the multiple entries. The interface should look like this, I don't think we need to change much of anything if we're smart about it.

Data -> binary
array<Data> -> binary
binary -> array<OffloadFile> // All share a reference to `binary`
copy(OffloadFile) -> copies the header in the shared buffer.

We will need to create single offload files when making the array, these should likely just use an index as an optional argument to the current interface.

https://github.com/llvm/llvm-project/pull/169425