[llvm] [DebugInfo][DWARF] Add heapallocsite information (PR #132073)

[Paul T Robinson via llvm-commits]

pogo59 wrote:

The new attribute should be documented. It doesn't *have* to be proposed to the DWARF committee, but that would be a good idea if anyone wants to implement the same feature in another compiler. I take it there's no gcc equivalent?

https://github.com/llvm/llvm-project/pull/132073