Add sanity test for CPU profiler

src/profile-generator.cc

Index: src/profile-generator.cc
diff --git a/src/profile-generator.cc b/src/profile-generator.cc
index ce07213b029403646a4f14d8086fc5269f57c6b3..e4c750cb83c1dbc8b489f2a08779d3b43ccacb0d 100644
--- a/src/profile-generator.cc
+++ b/src/profile-generator.cc
@@ -900,14 +900,6 @@ void ProfileGenerator::RecordTickSample(const TickSample& sample) {
       // that a callback calls itself.
       *(entries.start()) = NULL;
       *entry++ = code_map_.FindEntry(sample.external_callback);
-    } else if (sample.tos != NULL) {
-      // Find out, if top of stack was pointing inside a JS function
-      // meaning that we have encountered a frameless invocation.
-      *entry = code_map_.FindEntry(sample.tos);
-      if (*entry != NULL && !(*entry)->is_js_function()) {
-        *entry = NULL;
-      }
-      entry++;
     }
 
     for (const Address* stack_pos = sample.stack,