Add needs-unwind for proc macro tests

Rustc gives a warning when compiling proc macros with panic=abort.

tests/ui/proc-macro/allowed-signatures.rs

@@ -1,6 +1,7 @@
 //@ check-pass
 //@ force-host
 //@ no-prefer-dynamic
+//@ needs-unwind compiling proc macros with panic=abort causes a warning
 
 #![crate_type = "proc-macro"]
 #![allow(private_interfaces)]
@@ -9,7 +10,7 @@ use proc_macro::TokenStream;
 
 #[proc_macro]
 pub fn foo<T>(t: T) -> TokenStream {
-  TokenStream::new()
+    TokenStream::new()
 }
 
 trait Project {

tests/ui/proc-macro/crt-static.rs

@@ -7,6 +7,7 @@
 //@ force-host
 //@ no-prefer-dynamic
 //@ needs-dynamic-linking
+//@ needs-unwind compiling proc macros with panic=abort causes a warning
 
 #![crate_type = "proc-macro"]
 

tests/ui/proc-macro/no-mangle-in-proc-macro-issue-111888.rs

@@ -1,6 +1,7 @@
 //@ build-pass
 //@ force-host
 //@ no-prefer-dynamic
+//@ needs-unwind compiling proc macros with panic=abort causes a warning
 //@ aux-build:exports_no_mangle.rs
 #![crate_type = "proc-macro"]
 

tests/ui/proc-macro/no-missing-docs.rs

@@ -4,6 +4,7 @@
 //@ build-pass (FIXME(62277): could be check-pass?)
 //@ force-host
 //@ no-prefer-dynamic
+//@ needs-unwind compiling proc macros with panic=abort causes a warning
 
 #![crate_type = "proc-macro"]
 #![deny(missing_docs)]

tests/ui/proc-macro/proc-macro-deprecated-attr.rs

@@ -1,6 +1,7 @@
 //@ check-pass
 //@ force-host
 //@ no-prefer-dynamic
+//@ needs-unwind compiling proc macros with panic=abort causes a warning
 
 #![deny(deprecated)]
 

tests/ui/proc-macro/quote-debug.rs

@@ -2,6 +2,7 @@
 //@ force-host
 //@ no-prefer-dynamic
 //@ compile-flags: -Z unpretty=expanded
+//@ needs-unwind compiling proc macros with panic=abort causes a warning
 //
 // This file is not actually used as a proc-macro - instead,
 // it's just used to show the output of the `quote!` macro

tests/ui/proc-macro/quote-debug.stdout

@@ -4,6 +4,7 @@
 //@ force-host
 //@ no-prefer-dynamic
 //@ compile-flags: -Z unpretty=expanded
+//@ needs-unwind compiling proc macros with panic=abort causes a warning
 //
 // This file is not actually used as a proc-macro - instead,
 // it's just used to show the output of the `quote!` macro

tests/ui/rust-2018/proc-macro-crate-in-paths.rs

@@ -1,6 +1,7 @@
 //@ build-pass (FIXME(62277): could be check-pass?)
 //@ force-host
 //@ no-prefer-dynamic
+//@ needs-unwind compiling proc macros with panic=abort causes a warning
 
 #![crate_type = "proc-macro"]
 #![deny(rust_2018_compatibility)]