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

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 b038a0dd6a8e9478e84a6734a1c2016120ce82e4..fa63b186d09a16112248a4e0930a8c949e6ff93a 100644
--- a/pkg/compiler/lib/src/ssa/builder.dart
+++ b/pkg/compiler/lib/src/ssa/builder.dart
@@ -3497,6 +3497,12 @@ class SsaBuilder extends ast.Visitor
     } else if (isGrowableListConstructorCall) {
       push(buildLiteralList(<HInstruction>[]));
       stack.last.instructionType = elementType;
+    } else if (constructor.isExternal &&
+        constructor.isFromEnvironmentConstructor) {
+      generateUnsupportedError(
+          node,
+          '${cls.name}.${constructor.name} '
+          'can only be used as a const constructor');
     } else {
       SourceInformation sourceInformation =
           sourceInformationBuilder.buildNew(send);
@@ -3862,6 +3868,11 @@ class SsaBuilder extends ast.Visitor
     generateError(node, message, helper);
   }
 
+  void generateUnsupportedError(ast.Node node, String message) {
+    MethodElement helper = commonElements.throwUnsupportedError;
+    generateError(node, message, helper);
+  }
+
   void generateTypeError(ast.Node node, String message) {
     MethodElement helper = commonElements.throwTypeError;
     generateError(node, message, helper);