indicate what the program args line is.

llvm-svn: 66144
diff --git a/llvm/lib/Support/PrettyStackTrace.cpp b/llvm/lib/Support/PrettyStackTrace.cpp
index f4fb20e..0a51404 100644
--- a/llvm/lib/Support/PrettyStackTrace.cpp
+++ b/llvm/lib/Support/PrettyStackTrace.cpp
@@ -62,8 +62,10 @@
 }
 
 void PrettyStackTraceProgram::print(raw_ostream &OS) const {
+  OS << "Program arguments: ";
   // Print the argument list.
   for (unsigned i = 0, e = ArgC; i != e; ++i)
     OS << ArgV[i] << ' ';
   OS << '\n';
-}
\ No newline at end of file
+}
+