[turbofan] Fix bug in Rangify.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/699603002

Cr-Commit-Position: refs/heads/master@{#25067}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25067 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/compiler/typer.cc

@@ -408,7 +408,9 @@ Type* Typer::Visitor::FalsifyUndefined(Type* type, Typer* t) {
 
 Type* Typer::Visitor::Rangify(Type* type, Typer* t) {
   if (type->IsRange()) return type;        // Shortcut.
-  if (!type->Is(t->integer)) return type;  // Give up.
+  if (!type->Is(t->integer) && !type->Is(Type::Integral32())) {
+    return type;  // Give up.
+  }
   Factory* f = t->isolate()->factory();
   return Type::Range(f->NewNumber(type->Min()), f->NewNumber(type->Max()),
                      t->zone());