Ensure removing processed command line arguments.

test/cctest/test-flags.cc

Index: test/cctest/test-flags.cc
diff --git a/test/cctest/test-flags.cc b/test/cctest/test-flags.cc
index 32f1264f7f1ab7a8fd783596ca60dbeff1f0d1e8..9cb12c4787f59995e6807e7cdae2d52fdfa57824 100644
--- a/test/cctest/test-flags.cc
+++ b/test/cctest/test-flags.cc
@@ -159,7 +159,7 @@ TEST(Flags6) {
   CHECK_EQ(3, FlagList::SetFlagsFromCommandLine(&argc,
                                                 const_cast<char **>(argv),
                                                 true));
-  CHECK_EQ(4, argc);
+  CHECK_EQ(2, argc);
 }
 
 
@@ -232,3 +232,16 @@ TEST(FlagsJSArguments4) {
   CHECK_EQ(0, FLAG_js_arguments.argc());
 }
 
+
+TEST(FlagsRemoveIncomplete) {
+  // Test that processed command line arguments are removed, even
+  // if the list of arguments ends unexpectedly.
+  SetFlagsToDefault();
+  int argc = 3;
+  const char* argv[] = { "", "--crankshaft", "--expose-debug-as" };
+  CHECK_EQ(2, FlagList::SetFlagsFromCommandLine(&argc,
+                                                const_cast<char **>(argv),
+                                                true));
+  CHECK_NE(NULL, argv[1]);
+  CHECK_EQ(argc, 2);
+}