Add sanity test for CPU profiler

src/profile-generator.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 882 matching lines @@
   memset(entry, 0, entries.length() * sizeof(*entry));
   if (sample.pc != NULL) {
     *entry++ = code_map_.FindEntry(sample.pc);
 
     if (sample.has_external_callback) {
       // Don't use PC when in external callback code, as it can point
       // inside callback's code, and we will erroneously report
       // 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,
            *stack_end = stack_pos + sample.frames_count;
          stack_pos != stack_end;
          ++stack_pos) {
       *entry++ = code_map_.FindEntry(*stack_pos);
     }
   }
 
   if (FLAG_prof_browser_mode) {
     bool no_symbolized_entries = true;
     for (CodeEntry** e = entries.start(); e != entry; ++e) {
       if (*e != NULL) {
         no_symbolized_entries = false;
         break;
       }
     }
     // If no frames were symbolized, put the VM state entry in.
     if (no_symbolized_entries) {
       *entry++ = EntryForVMState(sample.state);
     }
   }
 
   profiles_->AddPathToCurrentProfiles(entries);
 }
 
 
 } }  // namespace v8::internal