CMake: Generate LIT site configuration file for Clang tests, which Daniel will probably have to fix

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@82086 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/lit.site.cfg.in b/test/lit.site.cfg.in
new file mode 100644
index 0000000..dfb0657
--- /dev/null
+++ b/test/lit.site.cfg.in
@@ -0,0 +1,6 @@
+## Autogenerated by LLVM/Clang configuration. 
+# Do not edit!
+config.clang_obj_root = "@CLANG_BINARY_DIR@"
+
+# Let the main config do the real work.
+lit.load_config(config, "@LLVM_SOURCE_DIR@/lit.cfg")