mark relevant tests as requiring unwinding

Author: pietroalbini

tests/ui/asm/aarch64/may_unwind.rs

@@ -1,6 +1,7 @@
 // only-aarch64
 // run-pass
 // needs-asm-support
+// needs-unwind
 
 #![feature(asm_unwind)]
 

tests/ui/test-attrs/test-panic-abort-disabled.rs

@@ -3,6 +3,7 @@
 // compile-flags: --test -Cpanic=abort -Zpanic-abort-tests=no
 // run-flags: --test-threads=1
 
+// needs-unwind
 // ignore-wasm no panic or subprocess support
 // ignore-emscripten no panic or subprocess support