Enable the user to control whether CXXConstructExpr will be added as a 
block-level expr. Currently CXXConstructExpr is always added as a block-level
expr. This caused two problems for the analyzer (and potentially for the
CFG-based codegen).
1. We have no way to know whether a ctor call is base or complete.
2. We have no way to know the destination object being contructed.

llvm-svn: 147306
diff --git a/clang/lib/Analysis/CFG.cpp b/clang/lib/Analysis/CFG.cpp
index 5bbccf5..df8d701 100644
--- a/clang/lib/Analysis/CFG.cpp
+++ b/clang/lib/Analysis/CFG.cpp
@@ -2768,7 +2768,7 @@
 CFGBlock *CFGBuilder::VisitCXXConstructExpr(CXXConstructExpr *C,
                                             AddStmtChoice asc) {
   autoCreateBlock();
-  if (!C->isElidable())
+  if (!C->isElidable() && asc.alwaysAdd(*this, C))
     appendStmt(Block, C);
 
   return VisitChildren(C);