Add test case for __ASSEMBLER__ definition.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@60363 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Preprocessor/assembler-with-cpp.S b/test/Preprocessor/assembler-with-cpp.S
new file mode 100644
index 0000000..2c2bd8d
--- /dev/null
+++ b/test/Preprocessor/assembler-with-cpp.S
@@ -0,0 +1,6 @@
+// RUN: clang -E %s &&
+// RUN: not clang -x c -E %s
+
+#ifndef __ASSEMBLER__
+#error "__ASSEMBLER__ not defined"
+#endif