Fix for issue 16967

sdk/lib/_internal/compiler/implementation/ssa/types_propagation.dart

Index: sdk/lib/_internal/compiler/implementation/ssa/types_propagation.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ssa/types_propagation.dart b/sdk/lib/_internal/compiler/implementation/ssa/types_propagation.dart
index 82b32bad82ff791c8b1dc5ca9ff53a4a06368a6e..716fb512ea3cd690b5f7201166d6964f5960d150 100644
--- a/sdk/lib/_internal/compiler/implementation/ssa/types_propagation.dart
+++ b/sdk/lib/_internal/compiler/implementation/ssa/types_propagation.dart
@@ -126,6 +126,13 @@ class SsaTypePropagator extends HBaseVisitor implements OptimizationPhase {
   }
 
   TypeMask visitNegate(HNegate instruction) {
+    HInstruction operand = instruction.operand;
+    // We have integer subclasses that represent ranges, so widen any int
+    // subclass to full integer.
+    if (operand.isInteger(compiler)) {
+      JavaScriptBackend backend = compiler.backend;
+      return backend.intType;
+    }
     return instruction.operand.instructionType;
   }