Update tests to use std::isnan instead of isnan

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index acc47b9c7663d3389004cc5c2212308cd063e493..9d05c0f795a55dc23fb0fe2ad780d90db863adc3 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -3344,7 +3344,7 @@ THREADED_TEST(ConversionException) {
   CheckUncle(&try_catch);
 
   double number_value = obj->NumberValue();
-  CHECK_NE(0, isnan(number_value));
+  CHECK_NE(0, std::isnan(number_value));
   CheckUncle(&try_catch);
 
   int64_t integer_value = obj->IntegerValue();
@@ -15445,7 +15445,7 @@ static uint64_t DoubleToBits(double value) {
 
 static double DoubleToDateTime(double input) {
   double date_limit = 864e13;
-  if (isnan(input) || input < -date_limit || input > date_limit) {
+  if (std::isnan(input) || input < -date_limit || input > date_limit) {
     return i::OS::nan_value();
   }
   return (input < 0) ? -(floor(-input)) : floor(input);
@@ -15506,7 +15506,7 @@ THREADED_TEST(QuietSignalingNaNs) {
     // Check that Number::New preserves non-NaNs and quiets SNaNs.
     v8::Handle<v8::Value> number = v8::Number::New(test_value);
     double stored_number = number->NumberValue();
-    if (!isnan(test_value)) {
+    if (!std::isnan(test_value)) {
       CHECK_EQ(test_value, stored_number);
     } else {
       uint64_t stored_bits = DoubleToBits(stored_number);
@@ -15525,7 +15525,7 @@ THREADED_TEST(QuietSignalingNaNs) {
     v8::Handle<v8::Value> date = v8::Date::New(test_value);
     double expected_stored_date = DoubleToDateTime(test_value);
     double stored_date = date->NumberValue();
-    if (!isnan(expected_stored_date)) {
+    if (!std::isnan(expected_stored_date)) {
       CHECK_EQ(expected_stored_date, stored_date);
     } else {
       uint64_t stored_bits = DoubleToBits(stored_date);