Fix build after r18344

"log" is an overloaded function, it cannot be resolved without explicit parameter type information

TBR=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/117723004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18345 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/assembler.cc

@@ -1388,10 +1388,15 @@ ExternalReference ExternalReference::address_of_regexp_stack_memory_size(
 #endif  // V8_INTERPRETED_REGEXP
 
 
+static double math_log_double(double x) {
+  return log(x);
+}
+
+
 ExternalReference ExternalReference::math_log_double_function(
     Isolate* isolate) {
   return ExternalReference(Redirect(isolate,
-                                    FUNCTION_ADDR(log),
+                                    FUNCTION_ADDR(math_log_double),
                                     BUILTIN_FP_CALL));
 }