[stubs] Add option to allow LO space allocation

src/code-stub-assembler.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CODE_STUB_ASSEMBLER_H_
 #define V8_CODE_STUB_ASSEMBLER_H_
 
 #include <functional>
 
 #include "src/compiler/code-assembler.h"
@@ skipping 40 matching lines @@
 class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
  public:
   typedef compiler::Node Node;
 
   CodeStubAssembler(compiler::CodeAssemblerState* state)
       : compiler::CodeAssembler(state) {}
 
   enum AllocationFlag : uint8_t {
     kNone = 0,
     kDoubleAlignment = 1,
-    kPretenured = 1 << 1
+    kPretenured = 1 << 1,
+    kAllowLargeObjectAllocation = 1 << 2,
   };
 
   typedef base::Flags<AllocationFlag> AllocationFlags;
 
   // TODO(ishell): Fix all loads/stores from arrays by int32 offsets/indices
   // and eventually remove INTEGER_PARAMETERS in favour of INTPTR_PARAMETERS.
   enum ParameterMode { INTEGER_PARAMETERS, SMI_PARAMETERS, INTPTR_PARAMETERS };
 
   // On 32-bit platforms, there is a slight performance advantage to doing all
   // of the array offset/index arithmetic with SMIs, since it's possible
@@ skipping 1056 matching lines @@
   }
 #else
 #define CSA_SLOW_ASSERT(csa, x) ((void)0)
 #endif
 
 DEFINE_OPERATORS_FOR_FLAGS(CodeStubAssembler::AllocationFlags);
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_CODE_STUB_ASSEMBLER_H_