Rename test prefix

Author: JohnTitor

tests/ui/crashes/issue-2862.rs renamed to tests/ui/crashes/ice-2862.rs

@@ -1,6 +1,6 @@
 // run-pass
 
-/// Test for https://github.com/rust-lang/rust-clippy/issues/2826
+/// Test for https://github.com/rust-lang/rust-clippy/issues/2862
 
 pub trait FooMap {
     fn map<B, F: Fn() -> B>(&self, f: F) -> B;