Remove HRuntimeType scheme for function types.

pkg/compiler/lib/src/ssa/ssa_tracer.dart

Index: pkg/compiler/lib/src/ssa/ssa_tracer.dart
diff --git a/pkg/compiler/lib/src/ssa/ssa_tracer.dart b/pkg/compiler/lib/src/ssa/ssa_tracer.dart
index 8e7dcbb6f78593188ca9e4020370f7c42f390e81..80f42f1b31d9a47fafd1791f443d717f624ac4b8 100644
--- a/pkg/compiler/lib/src/ssa/ssa_tracer.dart
+++ b/pkg/compiler/lib/src/ssa/ssa_tracer.dart
@@ -536,28 +536,6 @@ class HInstructionStringifier implements HVisitor<String> {
         " ($inputs)";
   }
 
-  String visitReadTypeVariable(HReadTypeVariable node) {
-    var inputs = node.inputs.map(temporaryId).join(', ');
-    return "ReadTypeVariable: ${node.dartType} ${node.hasReceiver} $inputs";
-  }
-
-  String visitFunctionType(HFunctionType node) {
-    var inputs = node.inputs.map(temporaryId).join(', ');
-    return "FunctionType: ${node.dartType} $inputs";
-  }
-
-  String visitVoidType(HVoidType node) {
-    return "VoidType";
-  }
-
-  String visitInterfaceType(HInterfaceType node) {
-    return "InterfaceType: ${node.dartType}";
-  }
-
-  String visitDynamicType(HDynamicType node) {
-    return "DynamicType";
-  }
-
   String visitAwait(HAwait node) {
     return "Await: ${temporaryId(node.inputs[0])}";
   }