Enable full type-checks in checked mode.

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

Index: sdk/lib/_internal/compiler/implementation/ssa/nodes.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ssa/nodes.dart b/sdk/lib/_internal/compiler/implementation/ssa/nodes.dart
index c1b9796ec9cbe58f70e8ea5889df11e536d25935..3dada638bcdb7da3150efe2f22a810a44cab6855 100644
--- a/sdk/lib/_internal/compiler/implementation/ssa/nodes.dart
+++ b/sdk/lib/_internal/compiler/implementation/ssa/nodes.dart
@@ -2177,7 +2177,6 @@ class HIndexAssign extends HInstruction {
   HInstruction get value => inputs[2];
 }
 
-// TODO(karlklose): use this class to represent type conversions as well.
 class HIs extends HInstruction {
   /// A check against a raw type: 'o is int', 'o is A'.
   static const int RAW_CHECK = 0;
@@ -2185,16 +2184,26 @@ class HIs extends HInstruction {
   static const int COMPOUND_CHECK = 1;
   /// A check against a single type variable: 'o is T'.
   static const int VARIABLE_CHECK = 2;
+  /// A checked-mode check against a raw type.
+  static const int RAW_ASSERT = 3;
 
   final DartType typeExpression;
   final bool nullOk;
   final int kind;
+  final bool isCheckedModeTest;
 
   HIs(this.typeExpression, List<HInstruction> inputs, this.kind,
-      {this.nullOk: false}) : super(inputs) {
-    assert(kind >= RAW_CHECK && kind <= VARIABLE_CHECK);
-    setUseGvn();
-    instructionType = HType.BOOLEAN;
+      this.isCheckedModeTest, HType instructionType, {this.nullOk: false})
+      : super(inputs) {
+    assert(kind >= RAW_CHECK && kind <= RAW_ASSERT);
+    assert(isCheckedModeTest || instructionType == HType.BOOLEAN);
+    assert(isCheckedModeTest || instructionType != RAW_ASSERT);
+    if (isCheckedModeTest) {
+      setAllSideEffects();
+    } else {
+      setUseGvn();
+    }
+    this.instructionType = instructionType;
   }
 
   HInstruction get expression => inputs[0];
@@ -2204,6 +2213,7 @@ class HIs extends HInstruction {
     return inputs[1];
   }
 
+  bool canThrow() => isCheckedModeTest;
   bool get isRawCheck => kind == RAW_CHECK;
   bool get isVariableCheck => kind == VARIABLE_CHECK;
   bool get isCompoundCheck => kind == COMPOUND_CHECK;