Replace math.h with cmath

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index f3a029ee340c79b043bbc7d239fb22cb6e4039b9..0ac8bca8823a6201dad2edbd1cace9e6febd337a 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -860,7 +860,7 @@ double Object::Number() {
 
 
 bool Object::IsNaN() {
-  return this->IsHeapNumber() && isnan(HeapNumber::cast(this)->value());
+  return this->IsHeapNumber() && std::isnan(HeapNumber::cast(this)->value());
 }
 
 
@@ -1921,7 +1921,7 @@ void FixedDoubleArray::set(int index, double value) {
   ASSERT(map() != HEAP->fixed_cow_array_map() &&
          map() != HEAP->fixed_array_map());
   int offset = kHeaderSize + index * kDoubleSize;
-  if (isnan(value)) value = canonical_not_the_hole_nan_as_double();
+  if (std::isnan(value)) value = canonical_not_the_hole_nan_as_double();
   WRITE_DOUBLE_FIELD(this, offset, value);
 }