[turbofan] Introduce initial support for TypedArrays.

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 656e38b1fa23aea279d27b63d3df45036f401b5b..4ddd49b6209e2f10d3276347804b71fe1325cd41 100644
--- a/src/compiler/simplified-operator.h
+++ b/src/compiler/simplified-operator.h
@@ -107,6 +107,8 @@ std::ostream& operator<<(std::ostream&, ElementAccess const&);
 
 ElementAccess const& ElementAccessOf(const Operator* op) WARN_UNUSED_RESULT;
 
+ExternalArrayType ExternalArrayTypeOf(const Operator* op) WARN_UNUSED_RESULT;
+
 enum class CheckFloat64HoleMode : uint8_t {
   kNeverReturnHole,  // Never return the hole (deoptimize instead).
   kAllowReturnHole   // Allow to return the hole (signaling NaN).
@@ -319,12 +321,18 @@ class SimplifiedOperatorBuilder final : public ZoneObject {
   // store-buffer buffer, offset, length, value
   const Operator* StoreBuffer(BufferAccess);
 
-  // load-element [base + index], length
+  // load-element [base + index]
   const Operator* LoadElement(ElementAccess const&);
 
-  // store-element [base + index], length, value
+  // store-element [base + index], value
   const Operator* StoreElement(ElementAccess const&);
 
+  // load-typed-element buffer, [base + external + index]
+  const Operator* LoadTypedElement(ExternalArrayType const&);
+
+  // store-typed-element buffer, [base + external + index], value
+  const Operator* StoreTypedElement(ExternalArrayType const&);
+
  private:
   Zone* zone() const { return zone_; }