[analyzer] Combine all ObjC message CallEvents into ObjCMethodCall.

As pointed out by Anna, we only differentiate between explicit message sends

This also adds support for ObjCSubscriptExprs, which are basically the same
as properties in many ways. We were already checking these, but not emitting
nice messages for them.

This depends on the llvm::PointerIntPair change in r160456.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160461 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/StaticAnalyzer/Checkers/CheckerDocumentation.cpp b/lib/StaticAnalyzer/Checkers/CheckerDocumentation.cpp
index 842cbc5..0e9efaa 100644
--- a/lib/StaticAnalyzer/Checkers/CheckerDocumentation.cpp
+++ b/lib/StaticAnalyzer/Checkers/CheckerDocumentation.cpp
@@ -81,8 +81,7 @@
   ///
   /// This will be called before the analyzer core processes the method call.
   /// This is called for any action which produces an Objective-C message send,
-  /// including explicit message syntax and property access. See the subclasses
-  /// of ObjCMethodCall for more details.
+  /// including explicit message syntax and property access.
   ///
   /// check::PreObjCMessage
   void checkPreObjCMessage(const ObjCMethodCall &M, CheckerContext &C) const {}