Remove factory body in *.fromEnvironment, and implement this same behavior

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 de794a45e69829088c7af774f79a8663cf0a76ac..6fa759ed7c59284a86b9d1dd3efc8d19077e0f7d 100644
--- a/pkg/compiler/lib/src/ssa/kernel_impact.dart
+++ b/pkg/compiler/lib/src/ssa/kernel_impact.dart
@@ -276,6 +276,14 @@ class KernelImpactBuilder extends ir.Visitor {
     if (commonElements.isSymbolConstructor(constructor)) {
       impactBuilder.registerFeature(Feature.SYMBOL_CONSTRUCTOR);
     }
+
+    if (target.isExternal &&
+        constructor.isFromEnvironmentConstructor &&
+        !isConst) {
+      impactBuilder.registerFeature(Feature.THROW_UNSUPPORTED_ERROR);
+      return;
+    }
+
     InterfaceType type = elementAdapter.createInterfaceType(
         target.enclosingClass, node.arguments.types);
     CallStructure callStructure =