Add needs-unwind to tests

Author: tmandry

src/test/ui/cfg/cfg-panic.rs

@@ -1,5 +1,6 @@
 // build-pass
 // compile-flags: -C panic=unwind
+// needs-unwind
 // ignore-emscripten no panic_unwind implementation
 // ignore-wasm32     no panic_unwind implementation
 // ignore-wasm64     no panic_unwind implementation

src/test/ui/panic-handler/weak-lang-item.rs

@@ -1,6 +1,7 @@
 // aux-build:weak-lang-items.rs
 // error-pattern: `#[panic_handler]` function required, but not found
 // error-pattern: language item required, but not found: `eh_personality`
+// needs-unwind since it affects the error output
 // ignore-emscripten compiled with panic=abort, personality not required
 
 #![no_std]

src/test/ui/panic-handler/weak-lang-item.stderr

@@ -1,5 +1,5 @@
 error[E0259]: the name `core` is defined multiple times
-  --> $DIR/weak-lang-item.rs:8:1
+  --> $DIR/weak-lang-item.rs:9:1
    |
 LL | extern crate core;
    | ^^^^^^^^^^^^^^^^^^ `core` reimported here

src/test/ui/panic-runtime/abort-link-to-unwind-dylib.rs

@@ -1,5 +1,6 @@
 // build-fail
 // compile-flags:-C panic=abort -C prefer-dynamic
+// needs-unwind
 // ignore-musl - no dylibs here
 // ignore-emscripten
 // ignore-sgx no dynamic lib support

src/test/ui/panic-runtime/lto-unwind.rs

@@ -2,6 +2,7 @@
 #![allow(unused_variables)]
 
 // compile-flags:-C lto -C panic=unwind
+// needs-unwind
 // no-prefer-dynamic
 // ignore-emscripten no processes
 // ignore-sgx no processes

src/test/ui/panic-runtime/transitive-link-a-bunch.rs

@@ -1,4 +1,5 @@
 // build-fail
+// needs-unwind
 // aux-build:panic-runtime-unwind.rs
 // aux-build:panic-runtime-abort.rs
 // aux-build:wants-panic-runtime-unwind.rs

src/test/ui/panic-runtime/want-unwind-got-abort.rs

@@ -1,4 +1,5 @@
 // build-fail
+// needs-unwind
 // error-pattern:is incompatible with this crate's strategy of `unwind`
 // aux-build:panic-runtime-abort.rs
 // aux-build:panic-runtime-lang-items.rs

src/test/ui/panic-runtime/want-unwind-got-abort2.rs

@@ -1,4 +1,5 @@
 // build-fail
+// needs-unwind
 // error-pattern:is incompatible with this crate's strategy of `unwind`
 // aux-build:panic-runtime-abort.rs
 // aux-build:wants-panic-runtime-abort.rs

src/test/ui/unwind-no-uwtable.rs

@@ -1,4 +1,5 @@
 // run-pass
+// needs-unwind
 // ignore-windows target requires uwtable
 // ignore-wasm32-bare no proper panic=unwind support
 // compile-flags: -C panic=unwind -C force-unwind-tables=n