[stubs] Enable machine graph verification for CodeStubAssembler and friends by default in debug mode

src/builtins/builtins.cc

Index: src/builtins/builtins.cc
diff --git a/src/builtins/builtins.cc b/src/builtins/builtins.cc
index 3ad419deda0603aa06974f46acfb1825a1c54d72..5997eb35506054e084c3a8394ea5f79b70aa8852 100644
--- a/src/builtins/builtins.cc
+++ b/src/builtins/builtins.cc
@@ -89,8 +89,7 @@ Code* BuildWithCodeStubAssemblerJS(Isolate* isolate,
   compiler::CodeAssemblerState state(isolate, &zone, argc_with_recv, flags,
                                      name);
   generator(&state);
-  Handle<Code> code =
-      compiler::CodeAssembler::GenerateCode(&state, FLAG_csa_verify);
+  Handle<Code> code = compiler::CodeAssembler::GenerateCode(&state);
   PostBuildProfileAndTracing(isolate, *code, name);
   return *code;
 }
@@ -109,8 +108,7 @@ Code* BuildWithCodeStubAssemblerCS(Isolate* isolate,
   DCHECK_LE(0, descriptor.GetRegisterParameterCount());
   compiler::CodeAssemblerState state(isolate, &zone, descriptor, flags, name);
   generator(&state);
-  Handle<Code> code =
-      compiler::CodeAssembler::GenerateCode(&state, FLAG_csa_verify);
+  Handle<Code> code = compiler::CodeAssembler::GenerateCode(&state);
   PostBuildProfileAndTracing(isolate, *code, name);
   return *code;
 }