Remove test statements that are now optimised away

Author: varkor

src/test/compile-fail/uninhabited-matches-feature-gated.rs

@@ -21,9 +21,6 @@ fn main() {
     let x: &Void = unsafe { std::mem::uninitialized() };
     let _ = match x {}; //~ ERROR non-exhaustive
 
-    let x: (Void,) = unsafe { std::mem::uninitialized() };
-    let _ = match x {}; //~ ERROR non-exhaustive
-
     let x: [Void; 1] = unsafe { std::mem::uninitialized() };
     let _ = match x {}; //~ ERROR non-exhaustive
 
@@ -32,9 +29,6 @@ fn main() {
         &[] => (),
     };
 
-    let x: Void = unsafe { std::mem::uninitialized() };
-    let _ = match x {}; // okay
-
     let x: Result<u32, Void> = Ok(23);
     let _ = match x {   //~ ERROR non-exhaustive
         Ok(x) => x,