Send SIGPROF signals on the profiler event processor thread

src/platform-freebsd.cc

Index: src/platform-freebsd.cc
diff --git a/src/platform-freebsd.cc b/src/platform-freebsd.cc
index 986c5af4dc77a3d5812e1c8a6bccabff24b13708..1af928e169da3af5cf0a9036eabc376423714540 100644
--- a/src/platform-freebsd.cc
+++ b/src/platform-freebsd.cc
@@ -898,4 +898,21 @@ void Sampler::Stop() {
 }
 
 
+bool Sampler::CanSampleOnProfilerEventsProcessorThread() {
+  return false;
+}
+
+
+void Sampler::DoSample() {
+}
+
+
+void Sampler::StartProfiling() {
+}
+
+
+void Sampler::StopProfiling() {
+}
+
+
 } }  // namespace v8::internal