Restore saved caller FP registers on stub failure

src/arguments.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 99 matching lines @@
 FOR_EACH_CALLBACK_TABLE_MAPPING_1(WRITE_CALL_1)
 FOR_EACH_CALLBACK_TABLE_MAPPING_2(WRITE_CALL_2)
 FOR_EACH_CALLBACK_TABLE_MAPPING_2_VOID_RETURN(WRITE_CALL_2_VOID)
 
 #undef WRITE_CALL_0
 #undef WRITE_CALL_1
 #undef WRITE_CALL_2
 #undef WRITE_CALL_2_VOID
 
 
+double ClobberDoubleRegisters(double x1, double x2, double x3, double x4) {
+  // TODO(ulan): This clobbers only subset of registers depending on compiler,
+  // Rewrite this in assembly to really clobber all registers.
+  return x1 * 1.01 + x2 * 2.02 + x3 * 3.03 + x4 * 4.04;
+}
+
+
 } }  // namespace v8::internal