Check for canBePrimitiveNumber when doing the intersection on a number type.

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

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of ssa;
 
 abstract class OptimizationPhase {
   String get name;
   void visitGraph(HGraph graph);
 }
@@ skipping 421 matching lines @@
     // in the remaining optimizations.
     return super.visitRelational(node);
   }
 
   HInstruction handleIdentityCheck(HRelational node) {
     HInstruction left = node.left;
     HInstruction right = node.right;
     HType leftType = left.instructionType;
     HType rightType = right.instructionType;
 
-    // We don't optimize on numbers to preserve the runtime semantics.
+    // Intersection of int and double return conflicting, so
+    // we don't optimize on numbers to preserve the runtime semantics.
     if (!(left.isNumberOrNull() && right.isNumberOrNull()) &&
         leftType.intersection(rightType, compiler).isConflicting()) {
       return graph.addConstantBool(false, constantSystem);
     }
 
     if (left.isConstantBoolean() && right.isBoolean()) {
       HConstant constant = left;
       if (constant.constant.isTrue()) {
         return right;
       } else {
@@ skipping 1089 matching lines @@
     HBasicBlock block = user.block;
     block.addAfter(user, interceptor);
     block.rewrite(user, interceptor);
     block.remove(user);
 
     // The interceptor will be removed in the dead code elimination
     // phase. Note that removing it here would not work because of how
     // the [visitBasicBlock] is implemented.
   }
 }