[llvm] [BOLT][NFC] Make YamlProfileToFunction a DenseMap (PR #108712)

[Maksim Panchenko via llvm-commits]

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@@ -105,7 +105,7 @@ class YAMLProfileReader : public ProfileReaderBase {
   yaml::bolt::BinaryProfile YamlBP;
 
   /// Map a function ID from a YAML profile to a BinaryFunction object.
-  std::vector<BinaryFunction *> YamlProfileToFunction;
+  DenseMap<uint32_t, BinaryFunction *> YamlProfileToFunction;
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maksfb wrote:

I'm curious if using `uint32_t` leads to more compact allocation compared to `uint64_t`?

https://github.com/llvm/llvm-project/pull/108712