[analyzer] Migrate NSErrorChecker and DereferenceChecker to CheckerV2.

They cooperate in that NSErrorChecker listens for ImplicitNullDerefEvent events that
DereferenceChecker can dispatch.
ImplicitNullDerefEvent is when we dereferenced a location that may be null.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@126659 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Analysis/bstring.c b/test/Analysis/bstring.c
index ff73d74..ec2cc86 100644
--- a/test/Analysis/bstring.c
+++ b/test/Analysis/bstring.c
@@ -1,7 +1,7 @@
-// RUN: %clang_cc1 -analyze -analyzer-checker=core.experimental.CString -analyzer-check-objc-mem -analyzer-store=region -verify %s
-// RUN: %clang_cc1 -analyze -DUSE_BUILTINS -analyzer-checker=core.experimental.CString -analyzer-check-objc-mem -analyzer-store=region -verify %s
-// RUN: %clang_cc1 -analyze -DVARIANT -analyzer-checker=core.experimental.CString -analyzer-check-objc-mem -analyzer-store=region -verify %s
-// RUN: %clang_cc1 -analyze -DUSE_BUILTINS -DVARIANT -analyzer-checker=core.experimental.CString -analyzer-check-objc-mem -analyzer-store=region -verify %s
+// RUN: %clang_cc1 -analyze -analyzer-checker=core,core.experimental.CString -analyzer-check-objc-mem -analyzer-store=region -verify %s
+// RUN: %clang_cc1 -analyze -DUSE_BUILTINS -analyzer-checker=core,core.experimental.CString -analyzer-check-objc-mem -analyzer-store=region -verify %s
+// RUN: %clang_cc1 -analyze -DVARIANT -analyzer-checker=core,core.experimental.CString -analyzer-check-objc-mem -analyzer-store=region -verify %s
+// RUN: %clang_cc1 -analyze -DUSE_BUILTINS -DVARIANT -analyzer-checker=core,core.experimental.CString -analyzer-check-objc-mem -analyzer-store=region -verify %s
 
 //===----------------------------------------------------------------------===
 // Declarations