Move heap and CPU profilers into a dedicated directory.

src/profiler/sampler.h

Index: src/profiler/sampler.h
diff --git a/src/sampler.h b/src/profiler/sampler.h
similarity index 97%
rename from src/sampler.h
rename to src/profiler/sampler.h
index bfdf9612291164a3a07c5e7bbc0a9f03673b79fc..ed932c0354289f230fc705654f3da59bd1e8417d 100644
--- a/src/sampler.h
+++ b/src/profiler/sampler.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef V8_SAMPLER_H_
-#define V8_SAMPLER_H_
+#ifndef V8_PROFILER_SAMPLER_H_
+#define V8_PROFILER_SAMPLER_H_
 
 #include "include/v8.h"
 
@@ -132,4 +132,4 @@ class Sampler {
 
 } }  // namespace v8::internal
 
-#endif  // V8_SAMPLER_H_
+#endif  // V8_PROFILER_SAMPLER_H_