Introduce DontEmitDebugCodeScope to fix the x64 nosnapshot build.

src/x64/full-codegen-x64.cc

 // Copyright 2012 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 345 matching lines @@
 
 
 void FullCodeGenerator::EmitProfilingCounterReset() {
   int reset_value = FLAG_interrupt_budget;
   __ Move(rbx, profiling_counter_, RelocInfo::EMBEDDED_OBJECT);
   __ Move(kScratchRegister, Smi::FromInt(reset_value));
   __ movp(FieldOperand(rbx, Cell::kValueOffset), kScratchRegister);
 }
 
 
+static const byte kJnsOffset = kPointerSize == kInt64Size ? 0x1d : 0x14;
+
+
 void FullCodeGenerator::EmitBackEdgeBookkeeping(IterationStatement* stmt,
                                                 Label* back_edge_target) {
   Comment cmnt(masm_, "[ Back edge bookkeeping");
   Label ok;
 
   ASSERT(back_edge_target->is_bound());
   int distance = masm_->SizeOfCodeGeneratedSince(back_edge_target);
   int weight = Min(kMaxBackEdgeWeight,
                    Max(1, distance / kCodeSizeMultiplier));
   EmitProfilingCounterDecrement(weight);
+
   __ j(positive, &ok, Label::kNear);
-  __ call(isolate()->builtins()->InterruptCheck(), RelocInfo::CODE_TARGET);
+  {
+    PredictableCodeSizeScope predictible_code_size_scope(masm_, kJnsOffset);
+    DontEmitDebugCodeScope dont_emit_debug_code_scope(masm_);
+    __ call(isolate()->builtins()->InterruptCheck(), RelocInfo::CODE_TARGET);
 
-  // Record a mapping of this PC offset to the OSR id.  This is used to find
-  // the AST id from the unoptimized code in order to use it as a key into
-  // the deoptimization input data found in the optimized code.
-  RecordBackEdge(stmt->OsrEntryId());
+    // Record a mapping of this PC offset to the OSR id.  This is used to find
+    // the AST id from the unoptimized code in order to use it as a key into
+    // the deoptimization input data found in the optimized code.
+    RecordBackEdge(stmt->OsrEntryId());
 
-  EmitProfilingCounterReset();
+    EmitProfilingCounterReset();
+  }
+  __ bind(&ok);
 
-  __ bind(&ok);
   PrepareForBailoutForId(stmt->EntryId(), NO_REGISTERS);
   // Record a mapping of the OSR id to this PC.  This is used if the OSR
   // entry becomes the target of a bailout.  We don't expect it to be, but
   // we want it to work if it is.
   PrepareForBailoutForId(stmt->OsrEntryId(), NO_REGISTERS);
 }
 
 
 void FullCodeGenerator::EmitReturnSequence() {
   Comment cmnt(masm_, "[ Return sequence");
@@ skipping 4440 matching lines @@
   *stack_depth = 0;
   *context_length = 0;
   return previous_;
 }
 
 
 #undef __
 
 
 static const byte kJnsInstruction = 0x79;
-static const byte kJnsOffset = kPointerSize == kInt64Size ? 0x1d : 0x14;
 static const byte kNopByteOne = 0x66;
 static const byte kNopByteTwo = 0x90;
 #ifdef DEBUG
 static const byte kCallInstruction = 0xe8;
 #endif
 
 
 void BackEdgeTable::PatchAt(Code* unoptimized_code,
                             Address pc,
                             BackEdgeState target_state,
@@ skipping 59 matching lines @@
   ASSERT_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(),
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64