LLVM currently stores heapallocsite information in CodeView debuginfo,
but not in DWARF debuginfo. Plumb it into DWARF as an LLVM-specific
extension.
heapallocsite debug information is useful when it is combined with
allocator instrumentation that stores caller addresses; I've used a
previous version of this patch for:
- analyzing memory usage by object type
- analyzing the distributions of values of class members
Other possible uses might be:
- attributing memory access profiles (for example, on Intel CPUs, from
PEBS records with Linear Data Address) to object types or specific
object members
- adding type information to crash/ASAN reports
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