Dart2js async-await. Bind the async-body to the current zone.

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

Index: pkg/compiler/lib/src/ssa/builder.dart
diff --git a/pkg/compiler/lib/src/ssa/builder.dart b/pkg/compiler/lib/src/ssa/builder.dart
index 310a5c756a54ab2f6ad9fe1005493af4c775a59b..328e8df8ed0c35529dbf23d37930456a7581361c 100644
--- a/pkg/compiler/lib/src/ssa/builder.dart
+++ b/pkg/compiler/lib/src/ssa/builder.dart
@@ -33,6 +33,8 @@ class SsaFunctionCompiler implements FunctionCompiler {
             backend.compiler.currentElement,
             asyncHelper:
                 backend.emitter.staticFunctionAccess(backend.getAsyncHelper()),
+            wrapBody:
+                backend.emitter.staticFunctionAccess(backend.getWrapBody()),
             newCompleter: backend.emitter.staticFunctionAccess(
                 backend.getCompleterConstructor()),
             safeVariableName: backend.namer.safeVariableName,
@@ -60,6 +62,8 @@ class SsaFunctionCompiler implements FunctionCompiler {
                 backend.getAsyncStarHelper()),
             streamOfController: backend.emitter.staticFunctionAccess(
                 backend.getStreamOfController()),
+            wrapBody:
+                backend.emitter.staticFunctionAccess(backend.getWrapBody()),
             newController: backend.emitter.staticFunctionAccess(
                 backend.getASyncStarControllerConstructor()),
             safeVariableName: backend.namer.safeVariableName,