[stubs] Fixing issues found by machine graph verifier in code stubs.

src/builtins/builtins.cc

Index: src/builtins/builtins.cc
diff --git a/src/builtins/builtins.cc b/src/builtins/builtins.cc
index 5997eb35506054e084c3a8394ea5f79b70aa8852..eaad9feaded8b64ea55f370c4312b0c455d10427 100644
--- a/src/builtins/builtins.cc
+++ b/src/builtins/builtins.cc
@@ -108,7 +108,14 @@ Code* BuildWithCodeStubAssemblerCS(Isolate* isolate,
   DCHECK_LE(0, descriptor.GetRegisterParameterCount());
   compiler::CodeAssemblerState state(isolate, &zone, descriptor, flags, name);
   generator(&state);
+
+  // TODO(ishell): remove this when code stub assembler graphs verification
+  // is enabled for all stubs.
+  bool saved_csa_verify = FLAG_csa_verify;
+  // Enable verification only in mksnapshot.
+  FLAG_csa_verify = DEBUG_BOOL && FLAG_startup_blob != nullptr;
   Handle<Code> code = compiler::CodeAssembler::GenerateCode(&state);
+  FLAG_csa_verify = saved_csa_verify;
   PostBuildProfileAndTracing(isolate, *code, name);
   return *code;
 }