[llvm] [Coverage] Rework Decision/Expansion/Branch (PR #78969)

[NAKAMURA Takumi via llvm-commits]

================
@@ -580,6 +583,72 @@ static unsigned getMaxBitmapSize(const CounterMappingContext &Ctx,
   return MaxBitmapID + (SizeInBits / CHAR_BIT);
 }
 
+struct DecisionRow {
+  const CounterMappingRegion *DecisionRegion;
+  LineColPair DecisionStartLoc;
+  LineColPair DecisionEndLoc;
+
+  SmallVector<const CounterMappingRegion *, 6> Branches;
----------------
chapuni wrote:

For now, the maximum number of conditions is 6.

https://github.com/llvm/llvm-project/pull/78969