Dump information when we hit the weird assertion failure in profiler

runtime/vm/profiler_service.cc

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/profiler_service.h"
 
 #include "vm/growable_array.h"
 #include "vm/hash_map.h"
 #include "vm/log.h"
 #include "vm/native_symbol.h"
@@ skipping 1603 matching lines @@
         current = AppendKind(code, current);
       }
       current = ProcessFunction(current, sample_index, sample, frame_index,
                                 function, token_position, code_index);
       if (!inclusive_tree_) {
         current = AppendKind(code, current);
       }
       return current;
     }
 
+    if (!code.is_optimized()) {
+      OS::PrintErr("Code that should be optimized is not. Please file a bug\n");
+      OS::PrintErr("Code object: %s\n", code.ToCString());
+      OS::PrintErr("Inlined functions length: %" Pd "\n",
+                   inlined_functions->length());
+      for (intptr_t i = 0; i < inlined_functions->length(); i++) {
+        OS::PrintErr("IF[%" Pd "] = %s\n", i,
+                     (*inlined_functions)[i]->ToFullyQualifiedCString());
+      }
+    }
+
     ASSERT(code.is_optimized());
 
     if (inclusive_tree_) {
       for (intptr_t i = 0; i < inlined_functions->length(); i++) {
         const Function* inlined_function = (*inlined_functions)[i];
         ASSERT(inlined_function != NULL);
         ASSERT(!inlined_function->IsNull());
         TokenPosition inlined_token_position = (*inlined_token_positions)[i];
         const bool inliner = i == 0;
         if (inliner) {
@@ skipping 1164 matching lines @@
   // Disable thread interrupts while processing the buffer.
   DisableThreadInterruptsScope dtis(thread);
 
   ClearProfileVisitor clear_profile(isolate);
   sample_buffer->VisitSamples(&clear_profile);
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart