Reduce the space used by the stack for the profiling thread.

src/platform-freebsd.cc

Index: src/platform-freebsd.cc
===================================================================
--- src/platform-freebsd.cc	(revision 10489)
+++ src/platform-freebsd.cc	(working copy)
@@ -464,18 +464,11 @@
 
 Thread::Thread(const Options& options)
     : data_(new PlatformData),
-      stack_size_(options.stack_size) {
-  set_name(options.name);
+      stack_size_(options.stack_size()) {
+  set_name(options.name());
 }
 
 
-Thread::Thread(const char* name)
-    : data_(new PlatformData),
-      stack_size_(0) {
-  set_name(name);
-}
-
-
 Thread::~Thread() {
   delete data_;
 }
@@ -717,8 +710,10 @@
     FULL_INTERVAL
   };
 
+  static const int kSignalSenderStackSize = 32 * KB;
+
   explicit SignalSender(int interval)
-      : Thread("SignalSender"),
+      : Thread(Thread::Options("SignalSender", kSignalSenderStackSize)),
         interval_(interval) {}
 
   static void AddActiveSampler(Sampler* sampler) {