Revert "Reland "Use off-heap data for type feedback in PolymorphicInstanceCallInstr""

runtime/vm/intermediate_language_x64.cc

Index: runtime/vm/intermediate_language_x64.cc
diff --git a/runtime/vm/intermediate_language_x64.cc b/runtime/vm/intermediate_language_x64.cc
index 644e8b2e9d12f8b49d6835765cb11ef9061f1571..03a3741b984141d01e465d7beaad632ef1e7a8ab 100644
--- a/runtime/vm/intermediate_language_x64.cc
+++ b/runtime/vm/intermediate_language_x64.cc
@@ -2856,12 +2856,8 @@ class CheckedSmiSlowPath : public SlowPathCode {
     }
     __ pushq(locs->in(0).reg());
     __ pushq(locs->in(1).reg());
-    const String& selector =
-        String::Handle(instruction_->call()->ic_data()->target_name());
-    const Array& argument_names =
-        Array::Handle(instruction_->call()->ic_data()->arguments_descriptor());
     compiler->EmitMegamorphicInstanceCall(
-        selector, argument_names, instruction_->call()->ArgumentCount(),
+        *instruction_->call()->ic_data(), instruction_->call()->ArgumentCount(),
         instruction_->call()->deopt_id(), instruction_->call()->token_pos(),
         locs, try_index_,
         /* slow_path_argument_count = */ 2);
@@ -3025,12 +3021,8 @@ class CheckedSmiComparisonSlowPath : public SlowPathCode {
     }
     __ pushq(locs->in(0).reg());
     __ pushq(locs->in(1).reg());
-    String& selector =
-        String::Handle(instruction_->call()->ic_data()->target_name());
-    Array& argument_names =
-        Array::Handle(instruction_->call()->ic_data()->arguments_descriptor());
     compiler->EmitMegamorphicInstanceCall(
-        selector, argument_names, instruction_->call()->ArgumentCount(),
+        *instruction_->call()->ic_data(), instruction_->call()->ArgumentCount(),
         instruction_->call()->deopt_id(), instruction_->call()->token_pos(),
         locs, try_index_,
         /* slow_path_argument_count = */ 2);