Stop leaking the target data.  (Leak found with valgrind.)

llvm-svn: 51579
diff --git a/clang/lib/CodeGen/ModuleBuilder.cpp b/clang/lib/CodeGen/ModuleBuilder.cpp
index 6387c62..1184307 100644
--- a/clang/lib/CodeGen/ModuleBuilder.cpp
+++ b/clang/lib/CodeGen/ModuleBuilder.cpp
@@ -46,6 +46,7 @@
     
     ~CodeGenerator() {
       delete Builder;
+      delete TD;
     }
     
     virtual void Initialize(ASTContext &Context) {