Fix unwanted float-to-double-promotions

test/cctest/test-heap.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 242 matching lines @@
     float lanes[4] = {1, 2, 3, 4};
     float quiet_NaN = std::numeric_limits<float>::quiet_NaN();
     float signaling_NaN = std::numeric_limits<float>::signaling_NaN();
 
     Handle<Float32x4> value = factory->NewFloat32x4(lanes);
     CHECK(value->IsFloat32x4());
     CheckSimdValue<Float32x4, float, 4>(*value, lanes, 3.14f);
 
     // Check special lane values.
     value->set_lane(1, -0.0);
-    CHECK_EQ(-0.0, value->get_lane(1));
+    CHECK_EQ(-0.0f, value->get_lane(1));
     CHECK(std::signbit(value->get_lane(1)));  // Sign bit should be preserved.
     value->set_lane(2, quiet_NaN);
     CHECK(std::isnan(value->get_lane(2)));
     value->set_lane(3, signaling_NaN);
     CHECK(std::isnan(value->get_lane(3)));
 
 #ifdef OBJECT_PRINT
     // Check value printing.
     {
       value = factory->NewFloat32x4(lanes);
@@ skipping 6150 matching lines @@
   // The CollectGarbage call above starts sweeper threads.
   // The crash will happen if the following two functions
   // are called before sweeping finishes.
   heap->StartIncrementalMarking();
   heap->FinalizeIncrementalMarkingIfComplete("test");
 }
 
 
 }  // namespace internal
 }  // namespace v8