- Fix for unsuccessful hoisting of CheckSmi in _HashMap.[]=

runtime/lib/isolate_patch.dart

Index: runtime/lib/isolate_patch.dart
===================================================================
--- runtime/lib/isolate_patch.dart	(revision 35450)
+++ runtime/lib/isolate_patch.dart	(working copy)
@@ -138,7 +138,16 @@
 
   // TODO(iposva): Ideally keep this map in the VM.
   // id to handler mapping.
-  static final Map _handlerMap = new HashMap();
+  static _initHandlerMap() {
+    // TODO(18511): Workaround bad CheckSmi hoisting.
+    var tempMap = new HashMap();
+    // Collect feedback that not all keys are Smis.
+    tempMap["."] = 1;
+    tempMap["."] = 2;
+
+    return new HashMap();
+  }
+  static final Map _handlerMap = _initHandlerMap();
 }