Pass context class directly to KernelSsaBuilder

pkg/compiler/lib/src/kernel/kernel_strategy.dart

Index: pkg/compiler/lib/src/kernel/kernel_strategy.dart
diff --git a/pkg/compiler/lib/src/kernel/kernel_strategy.dart b/pkg/compiler/lib/src/kernel/kernel_strategy.dart
index 8176c97ea018a119ae6e8aeab64ba95fbf6fcf9a..ca1c29ef7cd90bfa50e33554baffff76d6a66632 100644
--- a/pkg/compiler/lib/src/kernel/kernel_strategy.dart
+++ b/pkg/compiler/lib/src/kernel/kernel_strategy.dart
@@ -344,6 +344,7 @@ class KernelSsaBuilderTask extends CompilerTask implements SsaBuilderTask {
   HGraph build(CodegenWorkItem work, ClosedWorld closedWorld) {
     KernelSsaBuilder builder = new KernelSsaBuilder(
         work.element,
+        work.element.enclosingClass,
         _compiler,
         _elementMap,
         closedWorld,