[Symbol] Move VerifyDecl to ClangASTContext

VerifyDecl is specific to clang and is only used in ClangASTContext.

llvm-svn: 369456
diff --git a/lldb/source/Symbol/ClangASTContext.cpp b/lldb/source/Symbol/ClangASTContext.cpp
index d07adeb..7783950 100644
--- a/lldb/source/Symbol/ClangASTContext.cpp
+++ b/lldb/source/Symbol/ClangASTContext.cpp
@@ -82,7 +82,6 @@
 #include "lldb/Symbol/ClangUtil.h"
 #include "lldb/Symbol/ObjectFile.h"
 #include "lldb/Symbol/SymbolFile.h"
-#include "lldb/Symbol/VerifyDecl.h"
 #include "lldb/Target/ExecutionContext.h"
 #include "lldb/Target/Language.h"
 #include "lldb/Target/Process.h"
@@ -107,6 +106,11 @@
 using namespace clang;
 
 namespace {
+static void VerifyDecl(clang::Decl *decl) {
+  assert(decl && "VerifyDecl called with nullptr?");
+  decl->getAccess();
+}
+
 static inline bool
 ClangASTContextSupportsLanguage(lldb::LanguageType language) {
   return language == eLanguageTypeUnknown || // Clang is the default type system