[llvm] [Bitcode][Asm] Parse metadata value from operand bundles (PR #87570)

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Prabhuk wrote:

> Yeah, I don't think this was rebased in several months, otherwise, I'd expect a conflict between ToT and this patch.
> 
> If the comment about round tripping the operand bundle through bitcode and back to IR is still relevant, we should probably add a test, and update any bug tracking though. @Prabhuk would you mind following up on that part, since it seems like the functionality you're after is already in tree?

I've dropped this PR from my patchset. I'll verify if my reproducer (https://github.com/llvm/llvm-project/pull/89649) to test if the round tripping the operand bundle to bitcode and back to IR works correctly on top of main. If required, I'll update the tracking bug, if not I'll close this PR out.

https://github.com/llvm/llvm-project/pull/87570