Add type inference for super method invocations.

pkg/front_end/lib/src/fasta/kernel/frontend_accessors.dart

Index: pkg/front_end/lib/src/fasta/kernel/frontend_accessors.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/frontend_accessors.dart b/pkg/front_end/lib/src/fasta/kernel/frontend_accessors.dart
index 669e0f726575a9e28f8d1cd46a91015b61aaabb3..27ba25d99fe7e232857124c8c715c6a5b69fb81e 100644
--- a/pkg/front_end/lib/src/fasta/kernel/frontend_accessors.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/frontend_accessors.dart
@@ -511,7 +511,7 @@ class ThisIndexAccessor extends Accessor {
       : super(helper, token);
 
   Expression _makeSimpleRead() {
-    return new KernelMethodInvocation(new ThisExpression(), indexGetName,
+    return new KernelMethodInvocation(new KernelThisExpression(), indexGetName,
         new KernelArguments(<Expression>[index]),
         interfaceTarget: getter);
   }
@@ -519,8 +519,8 @@ class ThisIndexAccessor extends Accessor {
   Expression _makeSimpleWrite(Expression value, bool voidContext,
       KernelComplexAssignment complexAssignment) {
     if (!voidContext) return _makeWriteAndReturn(value, complexAssignment);
-    var write = new KernelMethodInvocation(new ThisExpression(), indexSetName,
-        new KernelArguments(<Expression>[index, value]),
+    var write = new KernelMethodInvocation(new KernelThisExpression(),
+        indexSetName, new KernelArguments(<Expression>[index, value]),
         interfaceTarget: setter)
       ..fileOffset = offsetForToken(token);
     complexAssignment?.write = write;
@@ -533,8 +533,8 @@ class ThisIndexAccessor extends Accessor {
   }
 
   Expression _makeRead(KernelComplexAssignment complexAssignment) {
-    var read = new KernelMethodInvocation(new ThisExpression(), indexGetName,
-        new KernelArguments(<Expression>[indexAccess()]),
+    var read = new KernelMethodInvocation(new KernelThisExpression(),
+        indexGetName, new KernelArguments(<Expression>[indexAccess()]),
         interfaceTarget: getter)
       ..fileOffset = offsetForToken(token);
     complexAssignment?.read = read;
@@ -544,8 +544,8 @@ class ThisIndexAccessor extends Accessor {
   Expression _makeWrite(Expression value, bool voidContext,
       KernelComplexAssignment complexAssignment) {
     if (!voidContext) return _makeWriteAndReturn(value, complexAssignment);
-    var write = new KernelMethodInvocation(new ThisExpression(), indexSetName,
-        new KernelArguments(<Expression>[indexAccess(), value]),
+    var write = new KernelMethodInvocation(new KernelThisExpression(),
+        indexSetName, new KernelArguments(<Expression>[indexAccess(), value]),
         interfaceTarget: setter)
       ..fileOffset = offsetForToken(token);
     complexAssignment?.write = write;
@@ -556,7 +556,7 @@ class ThisIndexAccessor extends Accessor {
       Expression value, KernelComplexAssignment complexAssignment) {
     var valueVariable = new VariableDeclaration.forValue(value);
     var write = new KernelMethodInvocation(
-        new ThisExpression(),
+        new KernelThisExpression(),
         indexSetName,
         new KernelArguments(
             <Expression>[indexAccess(), new VariableGet(valueVariable)]),