Fix misspelling of -fmodules-decluse.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191640 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 322fe5a..dd48bc1 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -3034,11 +3034,11 @@
     CmdArgs.push_back("-fmodule-maps");
   }
 
-  // -fmodule-decluse checks that modules used are declared so (off by default).
+  // -fmodules-decluse checks that modules used are declared so (off by default).
   if (Args.hasFlag(options::OPT_fmodules_decluse,
                    options::OPT_fno_modules_decluse,
                    false)) {
-    CmdArgs.push_back("-fmodule-decluse");
+    CmdArgs.push_back("-fmodules-decluse");
   }
 
   // If a module path was provided, pass it along. Otherwise, use a temporary