[clang] Support MemProf on darwin (PR #69640)

[Teresa Johnson via cfe-commits]

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@@ -279,13 +286,54 @@ struct Allocator {
     Print(Value->mib, Key, bool(Arg));
   }
 
+  using SegmentEntry = ::llvm::memprof::SegmentEntry;
   void FinishAndWrite() {
     if (print_text && common_flags()->print_module_map)
       DumpProcessMap();
 
     allocator.ForceLock();
 
     InsertLiveBlocks();
+#if SANITIZER_APPLE
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teresajohnson wrote:

Which part of this handling is Apple-specific?

https://github.com/llvm/llvm-project/pull/69640