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

[via llvm-commits]

thejh wrote:

@pinskia I'm not familiar with how DWARF standard development works in practice - do you mean just propose it for the DWARF standard, then add it to LLVM as an LLVM extension in parallel while the DWARF committee figures out whether they want to standardize it? Or actually land it in the (working draft? official?) DWARF standard before adding the feature to LLVM at all?

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