dart2js cps: Logical rewriter should treat Throw as a terminator.

pkg/compiler/lib/src/tree_ir/optimization/logical_rewriter.dart

Index: pkg/compiler/lib/src/tree_ir/optimization/logical_rewriter.dart
diff --git a/pkg/compiler/lib/src/tree_ir/optimization/logical_rewriter.dart b/pkg/compiler/lib/src/tree_ir/optimization/logical_rewriter.dart
index e4483f23f9b8e0857bf0ea89cbd19355e449ad5f..bc49dc750fd47f5d27e7d8f210fd3d9f9ac60764 100644
--- a/pkg/compiler/lib/src/tree_ir/optimization/logical_rewriter.dart
+++ b/pkg/compiler/lib/src/tree_ir/optimization/logical_rewriter.dart
@@ -95,7 +95,8 @@ class LogicalRewriter extends RecursiveTransformer
 
   bool isTerminator(Statement node) {
     return (node is Jump || node is Return) && !isFallthrough(node) ||
-           (node is ExpressionStatement && node.next is Unreachable);
+           (node is ExpressionStatement && node.next is Unreachable) ||
+           node is Throw;
   }
 
   Statement visitIf(If node) {