Revert "src: reduce cpu profiler overhead"

This reverts commit 1eb1e0a9af.

src/node.cc

@@ -2962,7 +2962,6 @@ char** Init(int argc, char *argv[]) {
   V8::SetFlagsFromCommandLine(&v8argc, v8argv, false);
 
 #ifdef __POSIX__
-  uv_loop_configure(uv_default_loop(), UV_LOOP_BLOCK_SIGNAL, SIGPROF);
   // Ignore SIGPIPE
   RegisterSignalHandler(SIGPIPE, SIG_IGN);
   RegisterSignalHandler(SIGINT, SignalExit);