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

[via llvm-commits]

thejh wrote:

For that old usecase, the tooling I built on top of DWARF heapallocsite debuginfo was able to print heap analysis like this: https://gist.github.com/thejh/92befd69a727b02aa4262075c554a872

That shows heap allocations grouped by allocation type, showing the three most common values of each member along with how often that value occurs.

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