Use early exits

Author: tblah

llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp

@@ -712,11 +712,12 @@ Error OpenMPIRBuilder::FinalizationInfo::mergeFiniBB(IRBuilderBase &Builder,
 
   // Replace FiniBB with OtherFiniBB.
   for (User *U : make_early_inc_range(FiniBB->users())) {
-    if (auto *Instr = dyn_cast<Instruction>(U)) {
-      for (unsigned I = 0, E = Instr->getNumSuccessors(); I != E; ++I) {
-        if (Instr->getSuccessor(I) == FiniBB)
-          Instr->setSuccessor(I, OtherFiniBB);
-      }
+    auto *Instr = dyn_cast<Instruction>(U);
+    if (!Instr)
+      continue;
+    for (unsigned I = 0, E = Instr->getNumSuccessors(); I != E; ++I) {
+      if (Instr->getSuccessor(I) == FiniBB)
+        Instr->setSuccessor(I, OtherFiniBB);
     }
   }
   assert(FiniBB->use_empty() && "Non branch use of FiniBB");