[lldb][NFC] Remove CompilerDeclContext::IsClang

This method is only used in ClangASTContext.

Also removes the includes we only needed for the ClangASTContext RTTI check
in the CompilerDecl[Context].cpp files.

1 files changed, 0 insertions, 5 deletions

diff --git a/lldb/source/Symbol/CompilerDeclContext.cpp b/lldb/source/Symbol/CompilerDeclContext.cpp
index 7d45f47ad13..672de6ec34d 100644
--- a/lldb/source/Symbol/CompilerDeclContext.cpp
+++ b/lldb/source/Symbol/CompilerDeclContext.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "lldb/Symbol/CompilerDeclContext.h"
-#include "lldb/Symbol/ClangASTContext.h"
 #include "lldb/Symbol/CompilerDecl.h"
 #include "lldb/Symbol/TypeSystem.h"
 #include <vector>
@@ -24,10 +23,6 @@ CompilerDeclContext::FindDeclByName(ConstString name,
     return std::vector<CompilerDecl>();
 }
 
-bool CompilerDeclContext::IsClang() const {
-  return IsValid() && llvm::isa<ClangASTContext>(m_type_system);
-}
-
 ConstString CompilerDeclContext::GetName() const {
   if (IsValid())
     return m_type_system->DeclContextGetName(m_opaque_decl_ctx);