Add "run-make" test for trace-macros flag

src/test/run-make/trace-macros-flag/Makefile

@@ -0,0 +1,9 @@
+# This test verifies that "-Z trace-macros"  works as it should. The traditional
+# "hello world" program provides a small example of this as not only println! is
+# listed, but also print! (since println! expands to this)
+
+-include ../tools.mk
+
+all:
+	$(RUSTC) -o $(TMPDIR)/hello -Z trace-macros hello.rs &> $(TMPDIR)/hello.trace
+	diff -u $(TMPDIR)/hello.trace hello.trace

src/test/run-make/trace-macros-flag/hello.rs

@@ -0,0 +1,13 @@
+// Copyright 2014 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.
+
+fn main() {
+    println!("Hello, World!");
+}

src/test/run-make/trace-macros-flag/hello.trace

@@ -0,0 +1,2 @@
+println! { "Hello, World!" }
+print! { concat ! ( "Hello, World!" , "\n" ) }