Remove the CFGElement "Invalid" state.

Use Optional<CFG*> where invalid states were needed previously. In the one case
where that's not possible (beginAutomaticObjDtorsInsert) just use a dummy
CFGAutomaticObjDtor.

Thanks for the help from Jordan Rose & discussion/feedback from Ted Kremenek
and Doug Gregor.

Post commit code review feedback on r175796 by Ted Kremenek.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@175938 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/StaticAnalyzer/Checkers/MallocOverflowSecurityChecker.cpp b/lib/StaticAnalyzer/Checkers/MallocOverflowSecurityChecker.cpp
index 7b63d67911..34425e3140 100644
--- a/lib/StaticAnalyzer/Checkers/MallocOverflowSecurityChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/MallocOverflowSecurityChecker.cpp
@@ -236,8 +236,8 @@ void MallocOverflowSecurityChecker::checkASTCodeBody(const Decl *D,
     CFGBlock *block = *it;
     for (CFGBlock::iterator bi = block->begin(), be = block->end();
          bi != be; ++bi) {
-      if (CFGStmt CS = bi->getAs<CFGStmt>()) {
-        if (const CallExpr *TheCall = dyn_cast<CallExpr>(CS.getStmt())) {
+      if (Optional<CFGStmt> CS = bi->getAs<CFGStmt>()) {
+        if (const CallExpr *TheCall = dyn_cast<CallExpr>(CS->getStmt())) {
           // Get the callee.
           const FunctionDecl *FD = TheCall->getDirectCallee();