Fix a few more bugs in preprocessor expressions w.r.t. ?:.  Now I 
think it is really right. :)  This fixes PR2284.

llvm-svn: 50665
diff --git a/clang/test/Preprocessor/expr_liveness.c b/clang/test/Preprocessor/expr_liveness.c
index da30616..3f4003e 100644
--- a/clang/test/Preprocessor/expr_liveness.c
+++ b/clang/test/Preprocessor/expr_liveness.c
@@ -30,6 +30,10 @@
 #if 1 ? 2 ? 3 : 4 : 5
 #endif
 
+// PR2284
+#if 1 ? 0: 1 ? 1/0: 1/0
+#endif
+
 #else