Add support for fixed parameters in the register allocator.

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 123 matching lines @@
   char* chars = reinterpret_cast<char*>(
       Isolate::Current()->current_zone()->Allocate(len));
   OS::SNPrint(chars, len, kFormat, function_name, reason);
   const Error& error = Error::Handle(
       LanguageError::New(String::Handle(String::New(chars))));
   Isolate::Current()->long_jump_base()->Jump(1, error);
 }
 
 
 intptr_t FlowGraphCompiler::StackSize() const {
-  return parsed_function_.stack_local_count() +
-      parsed_function_.copied_parameter_count();
+  if (is_ssa_) {
+    return block_order_[0]->AsGraphEntry()->spill_slot_count();
+  } else {
+    return parsed_function_.stack_local_count() +
+        parsed_function_.copied_parameter_count();
+  }
 }
 
 
 Label* FlowGraphCompiler::GetBlockLabel(
     BlockEntryInstr* block_entry) const {
   intptr_t block_index = block_entry->postorder_number();
   return &block_info_[block_index]->label;
 }
 
 
@@ skipping 638 matching lines @@
       return;
     }
   }
 
   // This move is not blocked.
   EmitMove(index);
 }
 
 
 }  // namespace dart