add a testcase, from Michael Spencer

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@106026 91177308-0d34-0410-b5e6-96231b3b80d8

test/Frontend/preprocessed-output-macro-first-token.c

@@ -0,0 +1,5 @@
+// This is the first thing other than comments and preprocessor stuff in the
+// file.
+//
+// RUN: %clang_cc1 -fms-extensions -E %s
+#pragma comment(lib, "somelib")