Fix struct/class mismatch for LTOModule and LTOCodeGenerator, detected by Clang

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/lto/LTOCodeGenerator.h b/tools/lto/LTOCodeGenerator.h
index 0ebec2c..2dd3f65 100644
--- a/tools/lto/LTOCodeGenerator.h
+++ b/tools/lto/LTOCodeGenerator.h
@@ -27,8 +27,7 @@
 // C++ class which implements the opaque lto_code_gen_t
 //
 
-class LTOCodeGenerator {
-public:
+struct LTOCodeGenerator {
     static const char*        getVersionString();
     
                             LTOCodeGenerator();