Add support for enabling DCHECKs in release mode

src/full-codegen.h

Index: src/full-codegen.h
diff --git a/src/full-codegen.h b/src/full-codegen.h
index 1439942db8ae33785ce817ba91d3c669e34cddf9..8b41b12b72281425de6b58e6793d5c0f55f0df97 100644
--- a/src/full-codegen.h
+++ b/src/full-codegen.h
@@ -1017,10 +1017,10 @@ class BackEdgeTable {
                                         Code* unoptimized_code,
                                         Address pc_after);
 
-#ifdef DEBUG
+#if DCHECK_IS_ON
   // Verify that all back edges of a certain loop depth are patched.
   static bool Verify(Isolate* isolate, Code* unoptimized_code);
-#endif  // DEBUG
+#endif  // DCHECK_IS_ON
 
  private:
   Address entry_at(uint32_t index) {