[lldb][NFC] Rename ClangASTContext to TypeSystemClang

Summary:
This commit renames ClangASTContext to TypeSystemClang to better reflect what this class is actually supposed to do
(implement the TypeSystem interface for Clang). It also gets rid of the very confusing situation that we have both a
`clang::ASTContext` and a `ClangASTContext` in clang (which sometimes causes Clang people to think I'm fiddling
with Clang's ASTContext when I'm actually just doing LLDB work).

I also have plans to potentially have multiple clang::ASTContext instances associated with one ClangASTContext so
the ASTContext naming will then become even more confusing to people.

Reviewers: #lldb, aprantl, shafik, clayborg, labath, JDevlieghere, davide, espindola, jdoerfert, xiaobai

Reviewed By: clayborg, labath, xiaobai

Subscribers: wuzish, emaste, nemanjai, mgorny, kbarton, MaskRay, arphaman, jfb, usaxena95, jingham, xiaobai, abidh, JDevlieghere, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D72684

1 files changed, 3 insertions, 3 deletions

diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangPersistentVariables.h b/lldb/source/Plugins/ExpressionParser/Clang/ClangPersistentVariables.h
index 434196b35fd5..2ebe1c7d2ad9 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangPersistentVariables.h
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangPersistentVariables.h
@@ -63,7 +63,7 @@ public:
   GetCompilerTypeFromPersistentDecl(ConstString type_name) override;
 
   void RegisterPersistentDecl(ConstString name, clang::NamedDecl *decl,
-                              ClangASTContext *ctx);
+                              TypeSystemClang *ctx);
 
   clang::NamedDecl *GetPersistentDecl(ConstString name);
 
@@ -84,8 +84,8 @@ private:
   struct PersistentDecl {
     /// The persistent decl.
     clang::NamedDecl *m_decl = nullptr;
-    /// The ClangASTContext for the ASTContext of m_decl.
-    ClangASTContext *m_context = nullptr;
+    /// The TypeSystemClang for the ASTContext of m_decl.
+    TypeSystemClang *m_context = nullptr;
   };
 
   typedef llvm::DenseMap<const char *, PersistentDecl> PersistentDeclMap;