libclang: some type safety for CXTranslationUnitImpl's internals

There is no reason to store pointers as 'void*' in CXTranslationUnitImpl, since
it does not affect libclang ABI.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173588 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CIndexDiagnostic.cpp b/tools/libclang/CIndexDiagnostic.cpp
index afccbb8..f48034e 100644
--- a/tools/libclang/CIndexDiagnostic.cpp
+++ b/tools/libclang/CIndexDiagnostic.cpp
@@ -209,7 +209,7 @@
 extern "C" {
 
 unsigned clang_getNumDiagnostics(CXTranslationUnit Unit) {
-  if (!Unit->TUData)
+  if (!cxtu::getASTUnit(Unit))
     return 0;
   return lazyCreateDiags(Unit, /*checkIfChanged=*/true)->getNumDiagnostics();
 }
@@ -227,7 +227,7 @@
 }
   
 CXDiagnosticSet clang_getDiagnosticSetFromTU(CXTranslationUnit Unit) {
-  if (!Unit->TUData)
+  if (!cxtu::getASTUnit(Unit))
     return 0;
   return static_cast<CXDiagnostic>(lazyCreateDiags(Unit));
 }