Replace math.h with cmath

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 2092859cd55deebe68fbbd54d51bb43a3ff3ac12..9fdc80824eac900af95695c6cba2e0e81146ae9c 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -951,7 +951,7 @@ bool Object::SameValue(Object* other) {
     double this_value = Number();
     double other_value = other->Number();
     return (this_value == other_value) ||
-        (isnan(this_value) && isnan(other_value));
+        (std::isnan(this_value) && std::isnan(other_value));
   }
   if (IsString() && other->IsString()) {
     return String::cast(this)->Equals(String::cast(other));
@@ -14391,7 +14391,7 @@ Object* JSDate::DoGetField(FieldIndex index) {
   }
 
   double time = value()->Number();
-  if (isnan(time)) return GetIsolate()->heap()->nan_value();
+  if (std::isnan(time)) return GetIsolate()->heap()->nan_value();
 
   int64_t local_time_ms = date_cache->ToLocal(static_cast<int64_t>(time));
   int days = DateCache::DaysFromTime(local_time_ms);
@@ -14410,7 +14410,7 @@ Object* JSDate::GetUTCField(FieldIndex index,
                             DateCache* date_cache) {
   ASSERT(index >= kFirstUTCField);
 
-  if (isnan(value)) return GetIsolate()->heap()->nan_value();
+  if (std::isnan(value)) return GetIsolate()->heap()->nan_value();
 
   int64_t time_ms = static_cast<int64_t>(value);