Add sema support for the nodebug attribute.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@64441 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/attr-nodebug.c b/test/Sema/attr-nodebug.c
new file mode 100644
index 0000000..a3b525c
--- /dev/null
+++ b/test/Sema/attr-nodebug.c
@@ -0,0 +1,8 @@
+// RUN: clang %s -verify -fsyntax-only
+
+int a __attribute__((nodebug)); // expected-warning {{'nodebug' attribute only applies to function types}}
+
+void t1() __attribute__((nodebug));
+
+void t2() __attribute__((nodebug(2))); // expected-error {{attribute requires 0 argument(s)}}
+