[llvm] Implements PGOBBAddrMap in Object and ObjectYAML with tests [1/5] (PR #71750)

[James Henderson via llvm-commits]

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@@ -875,6 +882,101 @@ struct BBAddrMap {
   std::vector<BBEntry> BBEntries; // Basic block entries for this function.
 };
 
+/// A feature extension of BBAddrMap that holds information relevant to PGO.
+struct PGOAnalysisMap {
+  /// Bitmask of optional features to include in the PGO extended map.
+  enum class Features {
+    FuncEntryCnt = (1 << 0),
+    BBFreq = (1 << 1),
+    BrProb = (1 << 2),
+  };
+
+  /// Super-set of BBAddrMap::BBEntry with additional fields for block frequency
+  /// and branch probability.
+  struct PGOBBEntry {
+    using BaseMetadata = BBAddrMap::BBEntry::Metadata;
+
+    /// Enum indicating the how many successors a block has. This enum must fit
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jh7370 wrote:

"the how many" - "the" looks misplaced?

https://github.com/llvm/llvm-project/pull/71750