Test that pgo-gen works properly.

Signed-off-by: Emilio Cobos Álvarez <emilio@crisal.io>

Author: emilio

src/test/run-make/pgo-gen/Makefile

@@ -0,0 +1,8 @@
+-include ../tools.mk
+
+all:
+ifeq ($(PROFILER_SUPPORT),1)
+	$(RUSTC) -g -C pgo-gen=test.profraw test.rs
+	$(call RUN,test) || exit 1
+	[ -e "$(TMPDIR)/test.profraw" ] || (echo "No .profraw file"; exit 1)
+endif

src/test/run-make/pgo-gen/test.rs

@@ -0,0 +1,11 @@
+// Copyright 2018 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() {}