Reduce space used for stackmaps.

runtime/vm/flow_graph_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/globals.h"  // Needed here to get TARGET_ARCH_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
@@ skipping 69 matching lines @@
     const GrowableArray<BlockEntryInstr*>& block_order,
     bool is_optimizing,
     bool is_ssa,
     bool is_leaf)
     : assembler_(assembler),
       parsed_function_(parsed_function),
       block_order_(block_order),
       current_block_(NULL),
       exception_handlers_list_(NULL),
       pc_descriptors_list_(NULL),
-      stackmap_table_builder_(is_ssa ? new StackmapTableBuilder() : NULL),
+      stackmap_table_builder_(NULL),
       block_info_(block_order.length()),
       deopt_stubs_(),
       object_table_(GrowableObjectArray::Handle(GrowableObjectArray::New())),
       is_optimizing_(is_optimizing),
       is_ssa_(is_ssa),
       is_dart_leaf_(is_leaf),
       bool_true_(Bool::ZoneHandle(Bool::True())),
       bool_false_(Bool::ZoneHandle(Bool::False())),
       double_class_(Class::ZoneHandle(
           Isolate::Current()->object_store()->double_class())),
       frame_register_allocator_(this, is_optimizing, is_ssa),
       parallel_move_resolver_(this) {
   ASSERT(assembler != NULL);
   ASSERT(is_optimizing_ || !is_ssa_);
+  if (is_ssa_) {
+    stackmap_table_builder_ = new StackmapTableBuilder(StackSize());
+  }
 }
 
 
 FlowGraphCompiler::~FlowGraphCompiler() {
   // BlockInfos are zone-allocated, so their destructors are not called.
   // Verify the labels explicitly here.
   for (int i = 0; i < block_info_.length(); ++i) {
     ASSERT(!block_info_[i]->label.IsLinked());
     ASSERT(!block_info_[i]->label.HasNear());
   }
@@ skipping 753 matching lines @@
       return;
     }
   }
 
   // This move is not blocked.
   EmitMove(index);
 }
 
 
 }  // namespace dart