Simplify the canonical clone method to copy

The optimized clone method ends up as the following MIR:

```
_2 = copy ((*_1).0: i32);
_3 = copy ((*_1).1: u64);
_4 = copy ((*_1).2: [i8; 3]);
_0 = Foo { a: move _2, b: move _3, c: move _4 };
```

We can transform this to:

```
_0 = copy (*_1);
```

1 files changed, 4 insertions, 2 deletions

diff --git a/tests/codegen/enum/unreachable_enum_default_branch.rs b/tests/codegen/enum/unreachable_enum_default_branch.rs
index 81a258f2722..76a92496c07 100644
--- a/tests/codegen/enum/unreachable_enum_default_branch.rs
+++ b/tests/codegen/enum/unreachable_enum_default_branch.rs
@@ -28,11 +28,13 @@ pub fn implicit_match(x: Int) -> bool {
 // The code is from https://github.com/rust-lang/rust/issues/110097.
 // We expect it to generate the same optimized code as a full match.
 // CHECK-LABEL: @if_let(
-// CHECK-NEXT:  start:
+// CHECK: start:
+// CHECK-NOT: zext
+// CHECK: select
 // CHECK-NEXT: insertvalue
 // CHECK-NEXT: insertvalue
 // CHECK-NEXT: ret
 #[no_mangle]
 pub fn if_let(val: Result<i32, ()>) -> Result<i32, ()> {
-    if let Ok(x) = val { Ok(x) } else { Err(()) }
+    if let Ok(x) = val { Ok(x * 2) } else { Err(()) }
 }