[PATCH] D152490: [llvm-profdata] Use StringRef for CallTargetMap

[Hongtao Yu via Phabricator via llvm-commits]

hoy added a subscriber: marksantaniello.
hoy added a comment.

Interestingly we've seen regression on memory usage with similar change. The reason is that an empty DenseMap preallocates a chunk of memory that turns out more expansive than a single string for our workload. cc @marksantaniello  @wenlei


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