Eliminate phase parameter in constructors

runtime/vm/flow_graph_type_propagator.cc

Index: runtime/vm/flow_graph_type_propagator.cc
diff --git a/runtime/vm/flow_graph_type_propagator.cc b/runtime/vm/flow_graph_type_propagator.cc
index 3c3725c8fb45d9b5714eef424ca679a5a111497b..7ea528a4a6fa010c8a8769d55d404071ad20934b 100644
--- a/runtime/vm/flow_graph_type_propagator.cc
+++ b/runtime/vm/flow_graph_type_propagator.cc
@@ -695,7 +695,7 @@ CompileType ParameterInstr::ComputeType() const {
   // verifying the run time type of the passed-in parameter and this check would
   // always be wrongly eliminated.
   // However there are parameters that are known to match their declared type:
-  // for example receiver and construction phase.
+  // for example receiver.
   GraphEntryInstr* graph_entry = block_->AsGraphEntry();
   // Parameters at catch blocks and OSR entries have type dynamic.
   //
@@ -727,11 +727,6 @@ CompileType ParameterInstr::ComputeType() const {
   LocalScope* scope = graph_entry->parsed_function().node_sequence()->scope();
   const AbstractType& type = scope->VariableAt(index())->type();
 
-  // Parameter is the constructor phase.
-  if ((index() == 1) && function.IsGenerativeConstructor()) {
-    return CompileType::FromAbstractType(type, CompileType::kNonNullable);
-  }
-
   // Parameter is the receiver.
   if ((index() == 0) &&
       (function.IsDynamicFunction() || function.IsGenerativeConstructor())) {