Implement the function.sent proposal.

src/full-codegen/x64/full-codegen-x64.cc

Index: src/full-codegen/x64/full-codegen-x64.cc
diff --git a/src/full-codegen/x64/full-codegen-x64.cc b/src/full-codegen/x64/full-codegen-x64.cc
index 615eb67ba6459542be354eda2ecab900a787d471..52e4eb277481d232e19483c40a4cc95d8b85861b 100644
--- a/src/full-codegen/x64/full-codegen-x64.cc
+++ b/src/full-codegen/x64/full-codegen-x64.cc
@@ -2035,6 +2035,13 @@ void FullCodeGenerator::EmitGeneratorResume(Expression *generator,
   VisitForAccumulatorValue(value);
   __ Pop(rbx);
 
+  // Store input value into generator object.
+  __ movp(FieldOperand(rbx, JSGeneratorObject::kInputOffset),
+          result_register());
+  __ movp(rcx, result_register());
+  __ RecordWriteField(rbx, JSGeneratorObject::kInputOffset, rcx, rdx,
+                      kDontSaveFPRegs);
+
   // Load suspended function and context.
   __ movp(rsi, FieldOperand(rbx, JSGeneratorObject::kContextOffset));
   __ movp(rdi, FieldOperand(rbx, JSGeneratorObject::kFunctionOffset));