Revert "Remove unused member (& consequently unused parameter) in SA's Call code."

...and instead add an accessor. We're not using this today, but it's something
that should probably stay in the source for potential clients, and it doesn't
cost a lot. (ObjCPropertyAccess is only created on the stack, and right now
there's only ever one alive at a time.)

This reverts r159581 / commit 8e674e1da34a131faa7d43dc3fcbd6e49120edbe.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159595 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/StaticAnalyzer/Core/PathSensitive/Calls.h b/include/clang/StaticAnalyzer/Core/PathSensitive/Calls.h
index 86001ba..f5d6309 100644
--- a/include/clang/StaticAnalyzer/Core/PathSensitive/Calls.h
+++ b/include/clang/StaticAnalyzer/Core/PathSensitive/Calls.h
@@ -405,13 +405,16 @@
 ///
 /// Example: obj.prop += 1;
 class ObjCPropertyAccess : public ObjCMethodCall {
+  const ObjCPropertyRefExpr *PropE;
   SourceRange EntireRange;
 
 public:
-  ObjCPropertyAccess(SourceRange range, const ObjCMessageExpr *Msg,
-                     const ProgramStateRef St, const LocationContext *LCtx)
-    : ObjCMethodCall(Msg, St, LCtx, CE_ObjCPropertyAccess), EntireRange(range)
-  {}
+  ObjCPropertyAccess(const ObjCPropertyRefExpr *pe, SourceRange range,
+                     const ObjCMessageExpr *Msg, const ProgramStateRef St,
+                     const LocationContext *LCtx)
+    : ObjCMethodCall(Msg, St, LCtx, CE_ObjCPropertyAccess), PropE(pe),
+      EntireRange(range)
+    {}
 
   /// \brief Returns true if this property access is calling the setter method.
   bool isSetter() const {
@@ -422,6 +425,10 @@
     return EntireRange;
   }
 
+  const ObjCPropertyRefExpr *getPropertyExpr() const {
+    return PropE;
+  }
+
   static bool classof(const CallEvent *CA) {
     return CA->getKind() == CE_ObjCPropertyAccess;
   }
diff --git a/lib/StaticAnalyzer/Core/ExprEngine.cpp b/lib/StaticAnalyzer/Core/ExprEngine.cpp
index ae38a12..63aa28f 100644
--- a/lib/StaticAnalyzer/Core/ExprEngine.cpp
+++ b/lib/StaticAnalyzer/Core/ExprEngine.cpp
@@ -881,8 +881,9 @@
         if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(syntactic))
           syntactic = BO->getLHS();
 
-        if (isa<ObjCPropertyRefExpr>(syntactic)) {
-          VisitObjCMessage(ObjCPropertyAccess(PO->getSourceRange(), ME,
+        if (const ObjCPropertyRefExpr *PR =
+              dyn_cast<ObjCPropertyRefExpr>(syntactic)) {
+          VisitObjCMessage(ObjCPropertyAccess(PR, PO->getSourceRange(), ME,
                                               Pred->getState(), LCtx),
                            Pred, Dst);
           evaluated = true;