make a64 compile on mavericks

test/cctest/test-utils-a64.cc

Index: test/cctest/test-utils-a64.cc
diff --git a/test/cctest/test-utils-a64.cc b/test/cctest/test-utils-a64.cc
index 5e5a2e1e4b79a07ec90a2415198a3e2b781047d1..e637a6e52b7d1138b300ab3b890c7b04cb126df1 100644
--- a/test/cctest/test-utils-a64.cc
+++ b/test/cctest/test-utils-a64.cc
@@ -62,7 +62,7 @@ bool EqualFP32(float expected, const RegisterDump*, float result) {
   if (float_to_rawbits(expected) == float_to_rawbits(result)) {
     return true;
   } else {
-    if (isnan(expected) || (expected == 0.0)) {
+    if (std::isnan(expected) || (expected == 0.0)) {
       printf("Expected 0x%08" PRIx32 "\t Found 0x%08" PRIx32 "\n",
              float_to_rawbits(expected), float_to_rawbits(result));
     } else {
@@ -81,7 +81,7 @@ bool EqualFP64(double expected, const RegisterDump*, double result) {
     return true;
   }
 
-  if (isnan(expected) || (expected == 0.0)) {
+  if (std::isnan(expected) || (expected == 0.0)) {
     printf("Expected 0x%016" PRIx64 "\t Found 0x%016" PRIx64 "\n",
            double_to_rawbits(expected), double_to_rawbits(result));
   } else {