Some minor fixes.

pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart

Index: pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
diff --git a/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart b/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
index e9b99b005687dbe15d8c3e925adbb18c1905942a..cd92b24ede0b138d7bb829b40c154279f7237567 100644
--- a/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
+++ b/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
@@ -200,7 +200,7 @@ class ShrinkingReducer extends PassMixin {
 
     Parameter parameter = task.node;
     Continuation continuation = parameter.parent;
-    int index = parameter.parent_index;
+    int index = parameter.parentIndex;
 
     // Remove the index'th argument from each invocation.
     Reference<Continuation> current = continuation.firstRef;
@@ -230,7 +230,7 @@ class ShrinkingReducer extends PassMixin {
     for (int i = index; i < parameters.length - 1; ++i) {
       Parameter p = parameters[i + 1];
       parameters[i] = p;
-      p.parent_index = i;
+      p.parentIndex = i;
     }
     parameters.removeLast();
 
@@ -468,7 +468,7 @@ class ParentVisitor extends RecursiveVisitor {
     int index = 0;
     node.parameters.forEach((Definition parameter) {
       parameter.parent = node;
-      if (parameter is Parameter) parameter.parent_index = index++;
+      if (parameter is Parameter) parameter.parentIndex = index++;
     });
   }
 
@@ -482,7 +482,7 @@ class ParentVisitor extends RecursiveVisitor {
     int index = 0;
     node.parameters.forEach((Definition parameter) {
       parameter.parent = node;
-      if (parameter is Parameter) parameter.parent_index = index++;
+      if (parameter is Parameter) parameter.parentIndex = index++;
     });
     node.initializers.forEach((Initializer i) => i.parent = node);
   }
@@ -587,7 +587,7 @@ class ParentVisitor extends RecursiveVisitor {
     int index = 0;
     node.parameters.forEach((Parameter parameter) {
       parameter.parent = node;
-      parameter.parent_index = index++;
+      parameter.parentIndex = index++;
     });
   }