[turbofan] inline %StringIteratorPrototype%.next in JSBuiltinReducer.

src/compiler/access-builder.cc

Index: src/compiler/access-builder.cc
diff --git a/src/compiler/access-builder.cc b/src/compiler/access-builder.cc
index f99f51ae236e1166cb09462b0141b3f939186405..530143440d52e4726bbceeabc2fe495023c7886e 100644
--- a/src/compiler/access-builder.cc
+++ b/src/compiler/access-builder.cc
@@ -548,6 +548,24 @@ FieldAccess AccessBuilder::ForJSGlobalObjectNativeContext() {
   return access;
 }
 
+// static
+FieldAccess AccessBuilder::ForJSStringIteratorString() {
+  FieldAccess access = {
+      kTaggedBase,    JSStringIterator::kStringOffset, Handle<Name>(),
+      Type::String(), MachineType::TaggedPointer(),    kPointerWriteBarrier};
+  return access;
+}
+
+// static
+FieldAccess AccessBuilder::ForJSStringIteratorIndex() {
+  FieldAccess access = {kTaggedBase,
+                        JSStringIterator::kNextIndexOffset,
+                        Handle<Name>(),
+                        TypeCache::Get().kStringLengthType,
+                        MachineType::TaggedSigned(),
+                        kNoWriteBarrier};
+  return access;
+}
 
 // static
 FieldAccess AccessBuilder::ForValue() {