Fix mod on ia32 without SSE2.

src/ia32/code-stubs-ia32.cc

 // Copyright 2012 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 1716 matching lines @@
           __ ret(0);
         }
       } else {  // SSE2 not available, use FPU.
         FloatingPointHelper::CheckFloatOperands(masm, &not_floats, ebx);
         FloatingPointHelper::LoadFloatOperands(
             masm,
             ecx,
             FloatingPointHelper::ARGS_IN_REGISTERS);
         FloatingPointHelper::CheckFloatOperandsAreInt32(masm, &not_int32);
         if (op_ == Token::MOD) {
+          // The operands are now on the FPU stack, but we don't need them.
+          __ fstp(0);
+          __ fstp(0);
           GenerateRegisterArgsPush(masm);
           __ InvokeBuiltin(Builtins::MOD, JUMP_FUNCTION);
         } else {
           switch (op_) {
             case Token::ADD: __ faddp(1); break;
             case Token::SUB: __ fsubp(1); break;
             case Token::MUL: __ fmulp(1); break;
             case Token::DIV: __ fdivp(1); break;
             default: UNREACHABLE();
           }
@@ skipping 5641 matching lines @@
                                  false);
   __ pop(edx);
   __ ret(0);
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32