Fix bug when generating padding to ensure space for lazy deoptimization.

src/x64/lithium-codegen-x64.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4094 matching lines @@
   int current_pc = masm()->pc_offset();
   int patch_size = Deoptimizer::patch_size();
   if (current_pc < last_lazy_deopt_pc_ + patch_size) {
     int padding_size = last_lazy_deopt_pc_ + patch_size - current_pc;
     while (padding_size > 0) {
       int nop_size = padding_size > 9 ? 9 : padding_size;
       __ nop(nop_size);
       padding_size -= nop_size;
     }
   }
-  last_lazy_deopt_pc_ = current_pc;
+  last_lazy_deopt_pc_ = masm()->pc_offset();
 }
 
 
 void LCodeGen::DoLazyBailout(LLazyBailout* instr) {
   EnsureSpaceForLazyDeopt();
   ASSERT(instr->HasEnvironment());
   LEnvironment* env = instr->environment();
   RegisterEnvironmentForDeoptimization(env, Safepoint::kLazyDeopt);
   safepoints_.RecordLazyDeoptimizationIndex(env->deoptimization_index());
 }
@@ skipping 105 matching lines @@
   RegisterEnvironmentForDeoptimization(environment, Safepoint::kNoLazyDeopt);
   ASSERT(osr_pc_offset_ == -1);
   osr_pc_offset_ = masm()->pc_offset();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64