update readme and do other cleanups

Author: matthiaskrgr

src/tools/opt-dist/src/tests.rs

@@ -96,7 +96,7 @@ llvm-config = "{llvm_config}"
         "tests/pretty",
         "tests/run-pass-valgrind",
         "tests/ui",
-        "tests/crases",
+        "tests/crashes",
     ];
     for test_path in env.skipped_tests() {
         args.extend(["--skip", test_path]);

tests/crashes/122909.rs

@@ -1,4 +1,6 @@
 //@ compile-flags: -Zpolymorphize=on -Zinline-mir=yes
+//@ known-bug: #12345
+
 
 use std::sync::{Arc, Context, Weak};
 

tests/crashes/README.md

@@ -7,7 +7,7 @@ or makes rustc crash in some other way.
 Accepted exit codes are: 101 (may be expanded later)
 
 When adding crashes from https://github.com/rust-lang/rust/issues, the
-issue number should be noted in the file name (12345.rs should suffice).
-
-If you happen to fix one of the crashes, please move it to `tests/ui`! :) 
+issue number should be noted in the file name (12345.rs should suffice)
+and perhaps also inside the file via `//@ known-bug #4321`
 
+If you happen to fix one of the crashes, please move it to `tests/ui`! :)