[compiler] Fix borked ARM build after r34572.

src/full-codegen/arm/full-codegen-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_ARM
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 4191 matching lines @@
 
 
 BackEdgeTable::BackEdgeState BackEdgeTable::GetBackEdgeState(
     Isolate* isolate,
     Code* unoptimized_code,
     Address pc) {
   DCHECK(Assembler::IsBlxIp(Memory::int32_at(pc - Assembler::kInstrSize)));
 
   Address pc_immediate_load_address = GetInterruptImmediateLoadAddress(pc);
   Address branch_address = pc_immediate_load_address - Assembler::kInstrSize;
+#ifdef DEBUG
   Address interrupt_address = Assembler::target_address_at(
       pc_immediate_load_address, unoptimized_code);
+#endif
 
   if (Assembler::IsBranch(Assembler::instr_at(branch_address))) {
     DCHECK(interrupt_address ==
            isolate->builtins()->InterruptCheck()->entry());
     return INTERRUPT;
   }
 
   DCHECK(Assembler::IsNop(Assembler::instr_at(branch_address)));
 
   DCHECK(interrupt_address ==
          isolate->builtins()->OnStackReplacement()->entry());
   return ON_STACK_REPLACEMENT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM