VM: Const-correctness fixes.

runtime/vm/intermediate_language.cc

 // Copyright (c) 2013, 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/intermediate_language.h"
 
 #include "vm/bit_vector.h"
 #include "vm/bootstrap.h"
 #include "vm/compiler.h"
 #include "vm/constant_propagator.h"
@@ skipping 612 matching lines @@
   // Update def-use chains whenever instructions are added to the graph
   // after initial graph construction.
   for (intptr_t i = tail->InputCount() - 1; i >= 0; --i) {
     Value* input = tail->InputAt(i);
     input->definition()->AddInputUse(input);
   }
   return tail;
 }
 
 
-BlockEntryInstr* Instruction::GetBlock() const {
+BlockEntryInstr* Instruction::GetBlock() {
   // TODO(fschneider): Implement a faster way to get the block of an
   // instruction.
   ASSERT(previous() != NULL);
   Instruction* result = previous();
   while (!result->IsBlockEntry()) result = result->previous();
   return result->AsBlockEntry();
 }
 
 
 void ForwardInstructionIterator::RemoveCurrentFromGraph() {
@@ skipping 3034 matching lines @@
   set_native_c_function(native_function);
   function().SetIsNativeAutoSetupScope(auto_setup_scope);
   Dart_NativeEntryResolver resolver = library.native_entry_resolver();
   bool is_bootstrap_native = Bootstrap::IsBootstapResolver(resolver);
   set_is_bootstrap_native(is_bootstrap_native);
 }
 
 #undef __
 
 }  // namespace dart