Update Clang for an API change to LLVM's switch case iterator (it is now

an actual iterator and so we need to look through it to the case
handle).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@300035 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGCleanup.cpp

@@ -609,7 +609,7 @@ static void destroyOptimisticNormalEntry(CodeGenFunction &CGF,
     llvm::SwitchInst *si = cast<llvm::SwitchInst>(use.getUser());
     if (si->getNumCases() == 1 && si->getDefaultDest() == unreachableBB) {
       // Replace the switch with a branch.
-      llvm::BranchInst::Create(si->case_begin().getCaseSuccessor(), si);
+      llvm::BranchInst::Create(si->case_begin()->getCaseSuccessor(), si);
 
       // The switch operand is a load from the cleanup-dest alloca.
       llvm::LoadInst *condition = cast<llvm::LoadInst>(si->getCondition());