Fix crash bug in disassembler.

runtime/vm/compiler.cc

 // Copyright (c) 2012, 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/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/block_scheduler.h"
@@ skipping 625 matching lines @@
     function.AttachCode(code);
   }
   if (parsed_function()->HasDeferredPrefixes()) {
     ASSERT(!FLAG_load_deferred_eagerly);
     ZoneGrowableArray<const LibraryPrefix*>* prefixes =
         parsed_function()->deferred_prefixes();
     for (intptr_t i = 0; i < prefixes->length(); i++) {
       (*prefixes)[i]->RegisterDependentCode(code);
     }
   }
+
+  if (FLAG_disassemble && FlowGraphPrinter::ShouldPrint(function)) {
+    Disassembler::DisassembleCode(function, optimized());
+  } else if (FLAG_disassemble_optimized &&
+             optimized() &&
+             FlowGraphPrinter::ShouldPrint(function)) {
+    Disassembler::DisassembleCode(function, true);
+  }
 }
 
 
 void CompileParsedFunctionHelper::CheckIfBackgroundCompilerIsBeingStopped() {
   ASSERT(Compiler::IsBackgroundCompilation());
   if (!isolate()->background_compiler()->is_running()) {
     // The background compiler is being stopped.
     Compiler::AbortBackgroundCompilation(Thread::kNoDeoptId,
         "Background compilation is being stopped");
   }
@@ skipping 652 matching lines @@
                 function.ToFullyQualifiedCString(),
                 Code::Handle(function.CurrentCode()).EntryPoint(),
                 Code::Handle(function.CurrentCode()).Size(),
                 per_compile_timer.TotalElapsedTime());
     }
 
     if (FLAG_support_debugger) {
       isolate->debugger()->NotifyCompilation(function);
     }
 
-    if (FLAG_disassemble && FlowGraphPrinter::ShouldPrint(function)) {
-      Disassembler::DisassembleCode(function, optimized);
-    } else if (FLAG_disassemble_optimized &&
-               optimized &&
-               FlowGraphPrinter::ShouldPrint(function)) {
-      Disassembler::DisassembleCode(function, true);
-    }
     DEBUG_ONLY(CheckInliningIntervals(function));
     return Error::null();
   } else {
     Thread* const thread = Thread::Current();
     StackZone stack_zone(thread);
     Error& error = Error::Handle();
     // We got an error during compilation or it is a bailout from background
     // compilation (e.g., during parsing with EnsureIsFinalized).
     error = thread->sticky_error();
     thread->clear_sticky_error();
@@ skipping 825 matching lines @@
 
 
 bool BackgroundCompiler::IsDisabled() {
   UNREACHABLE();
   return true;
 }
 
 #endif  // DART_PRECOMPILED_RUNTIME
 
 }  // namespace dart