libclang: factor out the frequent pattern static_cast<ASTUnit *>(TU->TUData)
into a getter cxtu::getASTUnit(TU)


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173585 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CIndexInclusionStack.cpp b/tools/libclang/CIndexInclusionStack.cpp
index 4ee1467..a6d3115 100644
--- a/tools/libclang/CIndexInclusionStack.cpp
+++ b/tools/libclang/CIndexInclusionStack.cpp
@@ -25,7 +25,7 @@
 void clang_getInclusions(CXTranslationUnit TU, CXInclusionVisitor CB,
                          CXClientData clientData) {
   
-  ASTUnit *CXXUnit = static_cast<ASTUnit *>(TU->TUData);
+  ASTUnit *CXXUnit = cxtu::getASTUnit(TU);
   SourceManager &SM = CXXUnit->getSourceManager();
   ASTContext &Ctx = CXXUnit->getASTContext();