If we're resolving all outstanding fixups, and there are multiple fixups

for the same destination, then we must potentially rewrite the initial branch
of every fixup.  Without this patch, a short-circuit check meant to prevent
a switch case from being redundantly added was preventing later fixups from
being processed.  Fixes PR8175 (again).

llvm-svn: 115586

clang/lib/CodeGen/CodeGenFunction.cpp

@@ -1340,11 +1340,9 @@ static void ResolveAllBranchFixups(CodeGenFunction &CGF,
   llvm::SmallPtrSet<llvm::BasicBlock*, 4> CasesAdded;
 
   for (unsigned I = 0, E = CGF.EHStack.getNumBranchFixups(); I != E; ++I) {
-    // Skip this fixup if its destination isn't set or if we've
-    // already treated it.
+    // Skip this fixup if its destination isn't set.
     BranchFixup &Fixup = CGF.EHStack.getBranchFixup(I);
     if (Fixup.Destination == 0) continue;
-    if (!CasesAdded.insert(Fixup.Destination)) continue;
 
     // If there isn't an OptimisticBranchBlock, then InitialBranch is
     // still pointing directly to its destination; forward it to the
@@ -1361,6 +1359,9 @@ static void ResolveAllBranchFixups(CodeGenFunction &CGF,
       Fixup.InitialBranch->setSuccessor(0, CleanupEntry);
     }
 
+    // Don't add this case to the switch statement twice.
+    if (!CasesAdded.insert(Fixup.Destination)) continue;
+
     Switch->addCase(CGF.Builder.getInt32(Fixup.DestinationIndex),
                     Fixup.Destination);
   }