auto merge of #15518 : alexcrichton/rust/fix-some-crate-names, r=sfackler

The output file was only being renamed based off #[crate_name], not #[crate_id]
or --crate-name. Both of these behaviors have been restored now.

src/test/run-make/crate-name-priority/Makefile

@@ -0,0 +1,13 @@
+-include ../tools.mk
+
+all:
+	$(RUSTC) foo.rs
+	rm $(TMPDIR)/$(call BIN,foo)
+	$(RUSTC) foo.rs --crate-name bar
+	rm $(TMPDIR)/$(call BIN,bar)
+	$(RUSTC) foo1.rs
+	rm $(TMPDIR)/$(call BIN,foo)
+	$(RUSTC) foo1.rs --crate-name bar
+	rm $(TMPDIR)/$(call BIN,bar)
+	$(RUSTC) foo1.rs --crate-name bar -o $(TMPDIR)/bar1
+	rm $(TMPDIR)/$(call BIN,bar1)

src/test/run-make/crate-name-priority/foo.rs

@@ -0,0 +1,11 @@
+// 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() {}

src/test/run-make/crate-name-priority/foo1.rs

@@ -0,0 +1,14 @@
+// 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.
+
+#![crate_name = "foo"]
+
+fn main() {}
+