Make stackmaps store their actual length.

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/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 208 matching lines @@
                        isolate);
       graph_compiler.CompileGraph();
     }
     {
       TimerScope timer(FLAG_compiler_stats,
                        &CompilerStats::codefinalizer_timer,
                        isolate);
       const Function& function = parsed_function.function();
       const Code& code = Code::Handle(Code::FinalizeCode(function, &assembler));
       code.set_is_optimized(optimized);
-      if (optimized && use_ssa) {
-        code.set_spill_slot_count(graph_compiler.StackSize());
-      }
       graph_compiler.FinalizePcDescriptors(code);
       graph_compiler.FinalizeDeoptInfo(code);
       graph_compiler.FinalizeStackmaps(code);
       graph_compiler.FinalizeVarDescriptors(code);
       graph_compiler.FinalizeExceptionHandlers(code);
       graph_compiler.FinalizeComments(code);
       if (optimized) {
         function.SetCode(code);
         CodePatcher::PatchEntry(Code::Handle(function.unoptimized_code()));
         if (FLAG_trace_compiler) {
@@ skipping 299 matching lines @@
     result = isolate->object_store()->sticky_error();
     isolate->object_store()->clear_sticky_error();
     isolate->set_long_jump_base(base);
     return result.raw();
   }
   UNREACHABLE();
   return Object::null();
 }
 
 }  // namespace dart