Nikita Popov 0fc624f029 [IR] Return AAMDNodes from Instruction::getMetadata() (NFC) ...

getMetadata() currently uses a weird API where it populates a
structure passed to it, and optionally merges into it. Instead,
we can return the AAMDNodes and provide a separate merge() API.
This makes usages more compact.

Differential Revision: https://reviews.llvm.org/D109852

2021-09-16 21:06:57 +02:00

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