Remove special casing of == null

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

Index: pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
diff --git a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
index 2a25e1a900fa33e0d59125249bf0b4e6e4696465..a4e816e46643f95522e812001e9a3c148724382d 100644
--- a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
+++ b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
@@ -580,7 +580,11 @@ class KernelAstTypeInferenceMap implements KernelToTypeInferenceMap {
     if (send.name.name == '[]=') {
       return closedWorld.commonMasks.dynamicType;
     }
-    return _resultOf(_target).typeOfSend(_astAdapter.getNode(send));
+    ast.Node node = _astAdapter.getNodeOrNull(send);
+    if (node == null) {
+      return closedWorld.commonMasks.dynamicType;

[Siggi Cherem (dart-lang), 2017/06/23 20:43:37]

should we list here what kind of `send` we expect here. For example, I imagine
we only want to include null-aware sends?

[Johnni Winther, 2017/06/26 10:47:40]

Asserted that `send.name.name == 'null'`.

+    }
+    return _resultOf(_target).typeOfSend(node);
   }
 
   TypeMask typeOfGet(ir.PropertyGet getter) {