Implement the function.sent proposal.

src/full-codegen/arm64/full-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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 4506 matching lines @@
   Register function = x4;
 
   // The value stays in x0, and is ultimately read by the resumed generator, as
   // if CallRuntime(Runtime::kSuspendJSGeneratorObject) returned it. Or it
   // is read to throw the value when the resumed generator is already closed. x1
   // will hold the generator object until the activation has been resumed.
   VisitForStackValue(generator);
   VisitForAccumulatorValue(value);
   __ Pop(generator_object);
 
+  // Store input value into generator object.
+  __ Str(result_register(),
+         FieldMemOperand(x1, JSGeneratorObject::kInputOffset));
+  __ Mov(x2, result_register());
+  __ RecordWriteField(x1, JSGeneratorObject::kInputOffset, x2, x3,
+                      kLRHasBeenSaved, kDontSaveFPRegs);
+
   // Load suspended function and context.
   __ Ldr(cp, FieldMemOperand(generator_object,
                              JSGeneratorObject::kContextOffset));
   __ Ldr(function, FieldMemOperand(generator_object,
                                    JSGeneratorObject::kFunctionOffset));
 
   // Load receiver and store as the first argument.
   __ Ldr(x10, FieldMemOperand(generator_object,
                               JSGeneratorObject::kReceiverOffset));
   __ Push(x10);
@@ skipping 297 matching lines @@
   }
 
   return INTERRUPT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64