[fullcodegen] Lift restriction on --debug-code flag.

src/full-codegen/arm64/full-codegen-arm64.cc

Index: src/full-codegen/arm64/full-codegen-arm64.cc
diff --git a/src/full-codegen/arm64/full-codegen-arm64.cc b/src/full-codegen/arm64/full-codegen-arm64.cc
index 98af9f41ecc921e6892b64f9e071e3fa7aa4c204..4f9ce1ddd87f71687f4abac565a1f5782bf27d6b 100644
--- a/src/full-codegen/arm64/full-codegen-arm64.cc
+++ b/src/full-codegen/arm64/full-codegen-arm64.cc
@@ -771,7 +771,7 @@ void FullCodeGenerator::EmitDebugCheckDeclarationContext(Variable* variable) {
   // The variable in the declaration always resides in the current function
   // context.
   DCHECK_EQ(0, scope()->ContextChainLength(variable->scope()));
-  if (generate_debug_code_) {
+  if (FLAG_debug_code) {
     // Check that we're not inside a with or catch context.
     __ Ldr(x1, FieldMemOperand(cp, HeapObject::kMapOffset));
     __ CompareRoot(x1, Heap::kWithContextMapRootIndex);