Remove some tests

tests/compile-fail/panic/rustc_allocator_nounwind.rs

@@ -1,10 +0,0 @@
-#![feature(rustc_attrs, c_unwind)]
-
-#[rustc_allocator_nounwind]
-extern "C-unwind" fn nounwind() {
-    panic!();
-}
-
-fn main() {
-    nounwind(); //~ ERROR unwinding past a stack frame that does not allow unwinding
-}

tests/run-pass/panic/good_unwind.rs

@@ -1,27 +0,0 @@
-#![feature(c_unwind, unboxed_closures, unwind_attributes)]
-
-use std::panic;
-
-extern "C-unwind" fn good_unwind_c() {
-    panic!();
-}
-
-#[unwind(allowed)]
-extern "C" fn good_unwind_allowed() {
-    panic!();
-}
-
-fn good_unwind_rust() {
-    panic!();
-}
-
-extern "rust-call" fn good_unwind_rust_call(_: ()) {
-    panic!();
-}
-
-fn main() {
-    panic::catch_unwind(|| good_unwind_c()).unwrap_err();
-    panic::catch_unwind(|| good_unwind_allowed()).unwrap_err();
-    panic::catch_unwind(|| good_unwind_rust()).unwrap_err();
-    good_unwind_rust_call(());
-}

tests/run-pass/panic/good_unwind.stderr

@@ -1,5 +0,0 @@
-thread 'main' panicked at 'explicit panic', $DIR/good_unwind.rs:6:5
-note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
-thread 'main' panicked at 'explicit panic', $DIR/good_unwind.rs:11:5
-thread 'main' panicked at 'explicit panic', $DIR/good_unwind.rs:15:5
-thread 'main' panicked at 'explicit panic', $DIR/good_unwind.rs:19:5