Fix typed lowering of JSUnaryNot to work with graph reducer.

src/compiler/js-generic-lowering.cc

Index: src/compiler/js-generic-lowering.cc
diff --git a/src/compiler/js-generic-lowering.cc b/src/compiler/js-generic-lowering.cc
index b8cf80389ca7d3c9b150da0e528fa8b93b36104a..49574f8754eea4e8c9286240173be40a82df1937 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -286,7 +286,6 @@ REPLACE_RUNTIME_CALL(JSCreateGlobalContext, Runtime::kAbort)
     UNIMPLEMENTED();                               \
     return node;                                   \
   }
-REPLACE_UNIMPLEMENTED(JSToString)
 REPLACE_UNIMPLEMENTED(JSToName)
 REPLACE_UNIMPLEMENTED(JSYield)
 REPLACE_UNIMPLEMENTED(JSDebugger)
@@ -411,6 +410,12 @@ Node* JSGenericLowering::LowerJSToBoolean(Node* node) {
 }
 
 
+Node* JSGenericLowering::LowerJSToString(Node* node) {
+  ReplaceWithBuiltinCall(node, Builtins::TO_STRING, 1);
+  return node;
+}
+
+
 Node* JSGenericLowering::LowerJSToObject(Node* node) {
   ReplaceWithBuiltinCall(node, Builtins::TO_OBJECT, 1);
   return node;