VM: Fix bug that can causes infinite opt/deopt loop.

runtime/vm/intermediate_language.h

 // 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.
 
 #ifndef VM_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 3014 matching lines @@
 // TODO(srdjan): Modify ComparisonInstr to allow 1 or 2 arguments, since
 // TestCidInstr needs only one argument
 class TestCidsInstr : public ComparisonInstr {
  public:
   TestCidsInstr(TokenPosition token_pos,
                 Token::Kind kind,
                 Value* value,
                 const ZoneGrowableArray<intptr_t>& cid_results,
                 intptr_t deopt_id)
       : ComparisonInstr(token_pos, kind, value, NULL, deopt_id),
-        cid_results_(cid_results) {
+        cid_results_(cid_results),
+        licm_hoisted_(false) {
     ASSERT((kind == Token::kIS) || (kind == Token::kISNOT));
     set_operation_cid(kObjectCid);
   }
 
   virtual intptr_t InputCount() const { return 1; }
 
   const ZoneGrowableArray<intptr_t>& cid_results() const {
     return cid_results_;
   }
 
@@ skipping 14 matching lines @@
   }
 
   virtual bool AttributesEqual(Instruction* other) const;
 
   virtual void EmitBranchCode(FlowGraphCompiler* compiler,
                               BranchInstr* branch);
 
   virtual Condition EmitComparisonCode(FlowGraphCompiler* compiler,
                                        BranchLabels labels);
 
+  void set_licm_hoisted(bool value) { licm_hoisted_ = value; }
+
   PRINT_OPERANDS_TO_SUPPORT
 
  private:
   const ZoneGrowableArray<intptr_t>& cid_results_;
+  bool licm_hoisted_;
   DISALLOW_COPY_AND_ASSIGN(TestCidsInstr);
 };
 
 
 class EqualityCompareInstr : public ComparisonInstr {
  public:
   EqualityCompareInstr(TokenPosition token_pos,
                        Token::Kind kind,
                        Value* left,
                        Value* right,
@@ skipping 5171 matching lines @@
   LocationSummary* Name::MakeLocationSummary(Zone* zone, bool opt) const {    \
     UNIMPLEMENTED();                                                          \
     return NULL;                                                              \
   }                                                                           \
   void Name::EmitNativeCode(FlowGraphCompiler* compiler) { UNIMPLEMENTED(); }
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_