re-add tests from fixed regressions

This should make sure that they stay fixed.

Author: arielb1

src/test/codegen/packed.rs

@@ -60,3 +60,14 @@ pub fn pkd_pair(pair1: &mut PackedPair, pair2: &mut PackedPair) {
     // CHECK: store i32 [[V2]], i32* {{.*}}, align 1
     *pair2 = *pair1;
 }
+
+#[repr(packed)]
+#[derive(Copy, Clone)]
+pub struct PackedNestedPair((u32, u32));
+
+// CHECK-LABEL: @pkd_nested_pair
+#[no_mangle]
+pub fn pkd_nested_pair(pair1: &mut PackedNestedPair, pair2: &mut PackedNestedPair) {
+// CHECK: call void @llvm.memcpy.{{.*}}(i8* %{{.*}}, i8* %{{.*}}, i{{[0-9]+}} 8, i32 1, i1 false)
+    *pair2 = *pair1;
+}

src/test/run-make/issue-46239/Makefile

@@ -0,0 +1,5 @@
+-include ../tools.mk
+
+all:
+	$(RUSTC) main.rs -C opt-level=1
+	$(call RUN,main)

src/test/run-make/issue-46239/main.rs

@@ -0,0 +1,18 @@
+// Copyright 2017 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 project<T>(x: &(T,)) -> &T { &x.0 }
+
+fn dummy() {}
+
+fn main() {
+    let f = (dummy as fn(),);
+    (*project(&f))();
+}

src/test/run-pass/issue-46519.rs

@@ -0,0 +1,37 @@
+// Copyright 2017 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.
+
+// compile-flags:--test -O
+
+#[test]
+#[should_panic(expected = "creating inhabited type")]
+fn test() {
+    FontLanguageOverride::system_font(SystemFont::new());
+}
+
+pub enum FontLanguageOverride {
+    Normal,
+    Override(&'static str),
+    System(SystemFont)
+}
+
+pub enum SystemFont {}
+
+impl FontLanguageOverride {
+    fn system_font(f: SystemFont) -> Self {
+        FontLanguageOverride::System(f)
+    }
+}
+
+impl SystemFont {
+    fn new() -> Self {
+        panic!("creating inhabited type")
+    }
+}