Auto merge of #29699 - tamird:valgrind-supp, r=alexcrichton

Quite a bit of cruft in the valgrind suppressions. I started from a clean slate and found a few unique failures; this commit also moves the tests "fixed" by these suppressions into run-pass-valgrind.

src/test/run-pass/atomic-print.rs

@@ -41,7 +41,7 @@ fn main(){
             match line.chars().next().unwrap() {
                 '1' => assert_eq!(line, "11111"),
                 '2' => assert_eq!(line, "22222"),
-                _   => panic!("Unexpected character")
+                chr => panic!("unexpected character {:?}", chr)
             }
         }
     }