Fix full code generator to not use --debug-code if it is in

src/x64/full-codegen-x64.cc

Index: src/x64/full-codegen-x64.cc
===================================================================
--- src/x64/full-codegen-x64.cc	(revision 12237)
+++ src/x64/full-codegen-x64.cc	(working copy)
@@ -759,7 +759,7 @@
   // The variable in the declaration always resides in the current function
   // context.
   ASSERT_EQ(0, scope()->ContextChainLength(variable->scope()));
-  if (FLAG_debug_code) {
+  if (generate_debug_code_) {
     // Check that we're not inside a with or catch context.
     __ movq(rbx, FieldOperand(rsi, HeapObject::kMapOffset));
     __ CompareRoot(rbx, Heap::kWithContextMapRootIndex);
@@ -2072,7 +2072,7 @@
     // in harmony mode.
     if (var->IsStackAllocated() || var->IsContextSlot()) {
       MemOperand location = VarOperand(var, rcx);
-      if (FLAG_debug_code && op == Token::INIT_LET) {
+      if (generate_debug_code_ && op == Token::INIT_LET) {
         // Check for an uninitialized let binding.
         __ movq(rdx, location);
         __ CompareRoot(rdx, Heap::kTheHoleValueRootIndex);
@@ -2612,7 +2612,7 @@
   context()->PrepareTest(&materialize_true, &materialize_false,
                          &if_true, &if_false, &fall_through);
 
-  if (FLAG_debug_code) __ AbortIfSmi(rax);
+  if (generate_debug_code_) __ AbortIfSmi(rax);
 
   // Check whether this map has already been checked to be safe for default
   // valueOf.
@@ -2836,7 +2836,7 @@
   __ movq(rax, Operand(rbx, ArgumentsAdaptorFrameConstants::kLengthOffset));
 
   __ bind(&exit);
-  if (FLAG_debug_code) __ AbortIfNotSmi(rax);
+  if (generate_debug_code_) __ AbortIfNotSmi(rax);
   context()->Plug(rax);
 }
 
@@ -3480,7 +3480,7 @@
   ASSERT(args->length() == 1);
   VisitForAccumulatorValue(args->at(0));
 
-  if (FLAG_debug_code) {
+  if (generate_debug_code_) {
     __ AbortIfNotString(rax);
   }
 
@@ -3560,7 +3560,7 @@
   // Loop condition: while (index < array_length).
   // Live loop registers: index(int32), array_length(int32), string(String*),
   //                      scratch, string_length(int32), elements(FixedArray*).
-  if (FLAG_debug_code) {
+  if (generate_debug_code_) {
     __ cmpq(index, array_length);
     __ Assert(below, "No empty arrays here in EmitFastAsciiArrayJoin");
   }