[turbofan] Introduce initial support for TypedArrays.

src/compiler/common-operator.h

Index: src/compiler/common-operator.h
diff --git a/src/compiler/common-operator.h b/src/compiler/common-operator.h
index 53debe1f5a6871e77ccea385bc9931aab8f045bb..774441765ca95ad49e123462092cfddf0c0a933f 100644
--- a/src/compiler/common-operator.h
+++ b/src/compiler/common-operator.h
@@ -248,6 +248,7 @@ class CommonOperatorBuilder final : public ZoneObject {
   const Operator* Call(const CallDescriptor* descriptor);
   const Operator* TailCall(const CallDescriptor* descriptor);
   const Operator* Projection(size_t index);
+  const Operator* Retain();
 
   // Constructs a new merge or phi operator with the same opcode as {op}, but
   // with {size} inputs.