Change the format! statics to be all-caps

This lets them get past the non_uppercase_statics lint mode (if it's turned on)

Closes #9631

src/test/run-pass/format-no-uppercase-statics.rs

@@ -0,0 +1,15 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#[deny(non_uppercase_statics)];
+
+pub fn main() {
+    println!("I generate statics with {0, select, other{#}}", "weird names");
+}