[Symbol] Give ClangASTContext a PersistentExpressionState instead of a ClangPersistentVariables

ClangASTContext doesn't use m_persistent_variables in a way specific to
ClangPersistentVariables. Therefore, it should hold a unique pointer to
PersistentExpressionState instead of a ClangPersistentVariablesUP.
This also prevents you from pulling in a plugin header when including
ClangASTContext.h

Doing this exposed an implicit dependency in ObjCLanguage that was
corrected by including ClangModulesDeclVendor.h

llvm-svn: 371470

lldb/include/lldb/Symbol/ClangASTContext.h

@@ -26,8 +26,8 @@
 #include "llvm/ADT/APSInt.h"
 #include "llvm/ADT/SmallVector.h"
 
-#include "Plugins/ExpressionParser/Clang/ClangPersistentVariables.h"
 #include "lldb/Core/ClangForward.h"
+#include "lldb/Expression/ExpressionVariable.h"
 #include "lldb/Symbol/CompilerType.h"
 #include "lldb/Symbol/TypeSystem.h"
 #include "lldb/Utility/ConstString.h"
@@ -1042,13 +1042,9 @@ public:
   }
 private:
   lldb::TargetWP m_target_wp;
-  lldb::ClangPersistentVariablesUP m_persistent_variables; ///< These are the
-                                                           ///persistent
-                                                           ///variables
-                                                           ///associated with
-                                                           ///this process for
-                                                           ///the expression
-                                                           ///parser.
+  std::unique_ptr<PersistentExpressionState>
+      m_persistent_variables; // These are the persistent variables associated
+                              // with this process for the expression parser
 };
 
 } // namespace lldb_private

lldb/source/Plugins/Language/ObjC/ObjCLanguage.cpp

@@ -22,6 +22,7 @@
 
 #include "llvm/Support/Threading.h"
 
+#include "Plugins/ExpressionParser/Clang/ClangModulesDeclVendor.h"
 #include "Plugins/LanguageRuntime/ObjC/ObjCLanguageRuntime.h"
 
 #include "CF.h"

lldb/source/Symbol/ClangASTContext.cpp

@@ -65,6 +65,7 @@
 #include "llvm/Support/Threading.h"
 
 #include "Plugins/ExpressionParser/Clang/ClangFunctionCaller.h"
+#include "Plugins/ExpressionParser/Clang/ClangPersistentVariables.h"
 #include "Plugins/ExpressionParser/Clang/ClangUserExpression.h"
 #include "Plugins/ExpressionParser/Clang/ClangUtilityFunction.h"
 #include "lldb/Utility/ArchSpec.h"