[BranchProbabilityInfo] Fixed contradiction between isEdgeHot() docs using >= 80% and code using > 80%

[agamkohli9]

Summary

BranchProbabilityInfo::isEdgeHot() contradictions:

Doxygen: We define hot as having a relative probability >= 80%

Comment: // Hot probability is at least 4/5 = 80%

Code: return getEdgeProbability(Src, Dst) > BranchProbability(4, 5);

llvm/lib/Analysis/BranchProbabilityInfo.cpp

for (const BasicBlock *Succ : successors(&BI))
       printEdgeProbability(OS << "  ", &BI, Succ);
   }
 }
 
 bool BranchProbabilityInfo::
 isEdgeHot(const BasicBlock *Src, const BasicBlock *Dst) const {
   // Hot probability is at least 4/5 = 80%
   // FIXME: Compare against a static "hot" BranchProbability.
-  return getEdgeProbability(Src, Dst) > BranchProbability(4, 5);
+  return getEdgeProbability(Src, Dst) >= BranchProbability(4, 5);
 }
 
 /// Get the raw edge probability for the edge. If can't find it, return a
 /// default probability 1/N where N is the number of successors. Here an edge is
 /// specified using PredBlock and an
 /// index to the successors.
 BranchProbability
 BranchProbabilityInfo::getEdgeProbability(const BasicBlock *Src,