double * int returns a double can be simplified to an int if both operands are constants. Therefore…

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

Index: sdk/lib/_internal/compiler/implementation/ssa/nodes.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/ssa/nodes.dart	(revision 31217)
+++ sdk/lib/_internal/compiler/implementation/ssa/nodes.dart	(working copy)
@@ -1931,6 +1931,12 @@
 
   // Maybe avoid this if the literal is big?
   bool isCodeMotionInvariant() => true;
+
+  set instructionType(type) {
+    assert((type.isEmpty && super.instructionType.isEmpty)
+           || !type.isNullable);
+    super.instructionType = type;
+  }
 }
 
 class HNot extends HInstruction {