Fix unwanted float-to-double-promotions

test/cctest/compiler/test-run-machops.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <cmath>
 #include <functional>
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/base/utils/random-number-generator.h"
@@ skipping 4848 matching lines @@
   double actual = 0.0f;
   float expected = 0.0;
   RawMachineAssemblerTester<int32_t> m;
   m.StoreToPointer(
       &actual, kMachFloat64,
       m.ChangeFloat32ToFloat64(m.LoadFromPointer(&expected, kMachFloat32)));
   m.Return(m.Int32Constant(0));
   FOR_FLOAT32_INPUTS(i) {
     expected = *i;
     CHECK_EQ(0, m.Call());
-    CHECK_EQ(expected, actual);
+    CHECK_EQ(static_cast<double>(expected), actual);
   }
 }
 
 
 TEST(RunChangeFloat32ToFloat64_spilled) {
   RawMachineAssemblerTester<int32_t> m;
   const int kNumInputs = 32;
   int32_t magic = 0x786234;
   float input[kNumInputs];
   double result[kNumInputs];
@@ skipping 549 matching lines @@
       c->CalleeSavedRegisters(),                         // callee saved
       c->CalleeSavedFPRegisters(),                       // callee saved FP
       CallDescriptor::kNoFlags,                          // flags
       "c-call-as-code");
   Node* call = r.AddNode(r.common()->Call(desc), phi);
   r.Return(call);
 
   CHECK_EQ(33, r.Call(1));
   CHECK_EQ(44, r.Call(0));
 }