Fix bogus comment.

llvm-svn: 249138
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 6c0be7c..694fdaa 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -402,7 +402,7 @@
                   {options::OPT_D, options::OPT_U, options::OPT_I_Group,
                    options::OPT_F, options::OPT_index_header_map});
 
-  // Add -Wp, and -Xassembler if using the preprocessor.
+  // Add -Wp, and -Xpreprocessor if using the preprocessor.
 
   // FIXME: There is a very unfortunate problem here, some troubled
   // souls abuse -Wp, to pass preprocessor options in gcc syntax. To