Split KernelToElementMap into sub-interfaces

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

Index: pkg/compiler/lib/src/ssa/kernel_impact.dart
diff --git a/pkg/compiler/lib/src/ssa/kernel_impact.dart b/pkg/compiler/lib/src/ssa/kernel_impact.dart
index 4e497c0be91d9930ccafbbc293235dd6f8bf7877..9eba59eca88af3ac8c946092dd998f4e9ad31108 100644
--- a/pkg/compiler/lib/src/ssa/kernel_impact.dart
+++ b/pkg/compiler/lib/src/ssa/kernel_impact.dart
@@ -63,7 +63,7 @@ ir.Member getIrMember(Compiler compiler, ResolvedAst resolvedAst) {
 }
 
 ResolutionImpact buildKernelImpact(
-    ir.Member member, KernelToElementMap elementAdapter) {
+    ir.Member member, KernelToElementMapForImpact elementAdapter) {
   KernelImpactBuilder builder = new KernelImpactBuilder(elementAdapter, member);
   if (member is ir.Procedure) {
     return builder.buildProcedure(member);
@@ -77,7 +77,7 @@ ResolutionImpact buildKernelImpact(
 
 class KernelImpactBuilder extends ir.Visitor {
   final ResolutionWorldImpactBuilder impactBuilder;
-  final KernelToElementMap elementAdapter;
+  final KernelToElementMapForImpact elementAdapter;
   final ir.Member currentMember;
 
   KernelImpactBuilder(this.elementAdapter, this.currentMember)