[llvm-dwarfdump] Avoid possible div-by-zero in debug output

Author: slydiman

llvm/tools/llvm-dwarfdump/Statistics.cpp

@@ -1044,14 +1044,19 @@ bool dwarfdump::collectStatsForObjectFile(ObjectFile &Obj, DWARFContext &DICtx,
                      LocStats.LocalVarNonEntryValLocStats);
   J.objectEnd();
   OS << '\n';
-  LLVM_DEBUG(llvm::dbgs() << "Total Availability: "
-                          << (int)std::round((VarParamWithLoc.Value * 100.0) /
+  LLVM_DEBUG(
+      llvm::dbgs() << "Total Availability: "
+                   << (VarParamTotal.Value
+                           ? (int)std::round((VarParamWithLoc.Value * 100.0) /
                                              VarParamTotal.Value)
-                          << "%\n";
-             llvm::dbgs() << "PC Ranges covered: "
-                          << (int)std::round(
+                           : 0)
+                   << "%\n";
+      llvm::dbgs() << "PC Ranges covered: "
+                   << (GlobalStats.ScopeBytes.Value
+                           ? (int)std::round(
                                  (GlobalStats.ScopeBytesCovered.Value * 100.0) /
                                  GlobalStats.ScopeBytes.Value)
-                          << "%\n");
+                           : 0)
+                   << "%\n");
   return true;
 }