Move CppInterOp.h into its own location; issue a warning to help users.

Currently we have the `CppInterOp.h` in `clang/Interpreter/` which makes people
think that it is a clang header file. This patch moves the header into its own
folder to avoid confusion.

Author: vgvassilev

include/CppInterOp/CppInterOp.h

@@ -1 +1 @@
-add_subdirectory(Interpreter)
+add_subdirectory(CppInterOp)

include/clang/Interpreter/CppInterOp.h

@@ -118,7 +118,7 @@ if(EMSCRIPTEN)
   # unit tests main_module you get errors due to undefined symbols. The reading of the file
   # below into a SYMBOLS_LIST variable is a temporary workaround that exports the undefined
   # symbols from the shared library, until it can be determined why they are not being exported already.
-  file(READ "${CMAKE_SOURCE_DIR}/lib/Interpreter/exports.ld" SYMBOLS_LIST)
+  file(READ "${CMAKE_CURRENT_SOURCE_DIR}/exports.ld" SYMBOLS_LIST)
 
   # Replace newlines with spaces
   string(REPLACE "\n" " " SYMBOLS_LIST "${SYMBOLS_LIST}")

lib/CMakeLists.txt

@@ -1,4 +1,6 @@
 #include "clang-c/CXCppInterOp.h"
+#include "CppInterOp/CppInterOp.h"
+
 #include "Compatibility.h"
 #include "clang/AST/CXXInheritance.h"
 #include "clang/AST/Decl.h"
@@ -7,7 +9,6 @@
 #include "clang/AST/RecordLayout.h"
 #include "clang/AST/Type.h"
 #include "clang/Frontend/CompilerInstance.h"
-#include "clang/Interpreter/CppInterOp.h"
 #include "clang/Sema/Lookup.h"
 #include "clang/Sema/Sema.h"
 #include "llvm/ADT/STLExtras.h"
@@ -619,4 +620,4 @@ void Destruct(compat::Interpreter& interp, TCppObject_t This,
 
 void clang_destruct(CXObject This, CXScope S, bool withFree) {
   Cpp::Destruct(*getInterpreter(S), This, getDecl(S), withFree);
-}
+}