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

src/compiler/simplified-operator.h

Index: src/compiler/simplified-operator.h
diff --git a/src/compiler/simplified-operator.h b/src/compiler/simplified-operator.h
index ca2bf6d24ba0aa507e1a41bdf05ba130b7d5f3f3..06ffc0c65831eb301eac3a48aac26dbff3d6cd8f 100644
--- a/src/compiler/simplified-operator.h
+++ b/src/compiler/simplified-operator.h
@@ -185,6 +185,14 @@ NumberOperationHint NumberOperationHintOf(const Operator* op)
 
 PretenureFlag PretenureFlagOf(const Operator* op) WARN_UNUSED_RESULT;
 
+enum class StringOperationHint : uint8_t {

[Benedikt Meurer, 2016/09/29 13:04:27]

Please remove this optimization from this CL. Let's look at that later.

+  kAny,                        // No restrictions on String input type
+  kSeqStringOrExternalString,  // SeqString or ExternalString only
+};
+
+StringOperationHint StringOperationHintOf(const Operator*) WARN_UNUSED_RESULT;
+UnicodeEncoding UnicodeEncodingOf(const Operator*) WARN_UNUSED_RESULT;
+
 // Interface for building simplified operators, which represent the
 // medium-level operations of V8, including adding numbers, allocating objects,
 // indexing into objects and arrays, etc.
@@ -287,8 +295,10 @@ class SimplifiedOperatorBuilder final : public ZoneObject {
   const Operator* StringEqual();
   const Operator* StringLessThan();
   const Operator* StringLessThanOrEqual();
-  const Operator* StringCharCodeAt();
+  const Operator* StringCharCodeAt(
+      StringOperationHint hint = StringOperationHint::kAny);
   const Operator* StringFromCharCode();
+  const Operator* StringFromCodePoint(UnicodeEncoding encoding);
 
   const Operator* PlainPrimitiveToNumber();
   const Operator* PlainPrimitiveToWord32();