[analyzer] Introduce CXXAllocatorCall to handle placement arg invalidation.

This is NOT full-blown support for operator new, but removes some nasty
duplicated code introduced in r158784.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159608 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp b/lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp
index 936bf9c..5940131 100644
--- a/lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/RetainCountChecker.cpp
@@ -947,6 +947,7 @@
   case CE_CXXMember:
   case CE_Block:
   case CE_CXXConstructor:
+  case CE_CXXAllocator:
     // FIXME: These calls are currently unsupported.
     return getPersistentStopSummary();
   case CE_ObjCMessage: