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

src/code-stubs.cc

Index: src/code-stubs.cc
diff --git a/src/code-stubs.cc b/src/code-stubs.cc
index 9ad51574c162ce65895e3025119957515ddefc8d..5b83bce8baa91dcb68bd4f10a2871bc310cc40d6 100644
--- a/src/code-stubs.cc
+++ b/src/code-stubs.cc
@@ -437,10 +437,7 @@ Handle<Code> TurboFanCodeStub::GenerateCode() {
   compiler::CodeAssemblerState state(isolate(), &zone, descriptor,
                                      GetCodeFlags(), name);
   GenerateAssembly(&state);
-  // TODO(ishell): enable verification once all issues are fixed.
-  // Enable verification only in mksnapshot.
-  bool verify_graph = FLAG_csa_verify && FLAG_startup_blob != nullptr;
-  return compiler::CodeAssembler::GenerateCode(&state, verify_graph);
+  return compiler::CodeAssembler::GenerateCode(&state);
 }
 
 #define ACCESSOR_ASSEMBLER(Name)                                       \