Don't call FastNewFunctionContextStub if context is bigger than kMaxRegularHeapObjectSize.

src/crankshaft/arm64/lithium-codegen-arm64.cc

 // Copyright 2013 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.
 
 #include "src/crankshaft/arm64/lithium-codegen-arm64.h"
 
 #include "src/arm64/frames-arm64.h"
 #include "src/base/bits.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 577 matching lines @@
     bool need_write_barrier = true;
     // Argument to NewContext is the function, which is in x1.
     int slots = info()->scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
     Safepoint::DeoptMode deopt_mode = Safepoint::kNoLazyDeopt;
     if (info()->scope()->is_script_scope()) {
       __ Mov(x10, Operand(info()->scope()->scope_info()));
       __ Push(x1, x10);
       __ CallRuntime(Runtime::kNewScriptContext);
       deopt_mode = Safepoint::kLazyDeopt;
     } else {
-      FastNewFunctionContextStub stub(isolate());
-      __ Mov(FastNewFunctionContextDescriptor::SlotsRegister(), slots);
-      __ CallStub(&stub);
-      // Result of FastNewFunctionContextStub is always in new space.
-      need_write_barrier = false;
+      if (slots <= FastNewFunctionContextStub::kMaximumSlots) {
+        FastNewFunctionContextStub stub(isolate());
+        __ Mov(FastNewFunctionContextDescriptor::SlotsRegister(), slots);
+        __ CallStub(&stub);
+        // Result of FastNewFunctionContextStub is always in new space.
+        need_write_barrier = false;
+      } else {
+        __ Push(x1);
+        __ CallRuntime(Runtime::kNewFunctionContext);
+      }
     }
     RecordSafepoint(deopt_mode);
     // Context is returned in x0. It replaces the context passed to us. It's
     // saved in the stack and kept live in cp.
     __ Mov(cp, x0);
     __ Str(x0, MemOperand(fp, StandardFrameConstants::kContextOffset));
     // Copy any necessary parameters into the context.
     int num_parameters = info()->scope()->num_parameters();
     int first_parameter = info()->scope()->has_this_declaration() ? -1 : 0;
     for (int i = first_parameter; i < num_parameters; i++) {
@@ skipping 4961 matching lines @@
   // Index is equal to negated out of object property index plus 1.
   __ Sub(result, result, Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ Ldr(result, FieldMemOperand(result,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ Bind(deferred->exit());
   __ Bind(&done);
 }
 
 }  // namespace internal
 }  // namespace v8