Move *BSD and Solaris Sampler implementations into sampler.cc

src/v8.cc

Index: src/v8.cc
diff --git a/src/v8.cc b/src/v8.cc
index df92690903918d435b029007712993e0aaf3c29e..494bb30d9a03eee848c8c569868629cb8dbdee3c 100644
--- a/src/v8.cc
+++ b/src/v8.cc
@@ -41,6 +41,7 @@
 #include "objects.h"
 #include "once.h"
 #include "platform.h"
+#include "sampler.h"
 #include "runtime-profiler.h"
 #include "serialize.h"
 #include "store-buffer.h"
@@ -123,6 +124,7 @@ void V8::TearDown() {
   delete call_completed_callbacks_;
   call_completed_callbacks_ = NULL;
 
+  Sampler::TearDown();
   OS::TearDown();
 }
 
@@ -270,6 +272,7 @@ void V8::InitializeOncePerProcessImpl() {
   }
   if (FLAG_trace_hydrogen) FLAG_parallel_recompilation = false;
   OS::SetUp();
+  Sampler::SetUp();
   CPU::SetUp();
   use_crankshaft_ = FLAG_crankshaft
       && !Serializer::enabled()