Rollup merge of #70704 - danielframpton:aarch64-windows-panic-unwind-…

…default, r=alexcrichton

Make panic unwind the default for aarch64-*-windows-msvc targets

With the llvm fixes from rust-lang/llvm-project#45 (included as a submodule change) we can enable unwinding by default for these targets.

Fixes #65313

There are still a small number of test failures for which we can open individual issues.

r? @alexcrichton

src/libpanic_unwind/lib.rs

@@ -47,9 +47,6 @@ cfg_if::cfg_if! {
     } else if #[cfg(target_os = "hermit")] {
         #[path = "hermit.rs"]
         mod real_imp;
-    } else if #[cfg(all(target_env = "msvc", target_arch = "aarch64"))] {
-        #[path = "dummy.rs"]
-        mod real_imp;
     } else if #[cfg(target_env = "msvc")] {
         #[path = "seh.rs"]
         mod real_imp;

src/libpanic_unwind/seh.rs

@@ -117,7 +117,7 @@ mod imp {
     }
 }
 
-#[cfg(any(target_arch = "x86_64", target_arch = "arm"))]
+#[cfg(not(target_arch = "x86"))]
 #[macro_use]
 mod imp {
     pub type ptr_t = u32;

src/librustc_target/spec/aarch64_pc_windows_msvc.rs

@@ -1,14 +1,11 @@
-use crate::spec::{LinkerFlavor, PanicStrategy, Target, TargetResult};
+use crate::spec::{LinkerFlavor, Target, TargetResult};
 
 pub fn target() -> TargetResult {
     let mut base = super::windows_msvc_base::opts();
     base.max_atomic_width = Some(64);
     base.has_elf_tls = true;
     base.features = "+neon,+fp-armv8".to_string();
 
-    // FIXME: this shouldn't be panic=abort, it should be panic=unwind
-    base.panic_strategy = PanicStrategy::Abort;
-
     Ok(Target {
         llvm_target: "aarch64-pc-windows-msvc".to_string(),
         target_endian: "little".to_string(),

src/librustc_target/spec/aarch64_uwp_windows_msvc.rs

@@ -1,13 +1,10 @@
-use crate::spec::{LinkerFlavor, PanicStrategy, Target, TargetResult};
+use crate::spec::{LinkerFlavor, Target, TargetResult};
 
 pub fn target() -> TargetResult {
     let mut base = super::windows_uwp_msvc_base::opts();
     base.max_atomic_width = Some(64);
     base.has_elf_tls = true;
 
-    // FIXME: this shouldn't be panic=abort, it should be panic=unwind
-    base.panic_strategy = PanicStrategy::Abort;
-
     Ok(Target {
         llvm_target: "aarch64-pc-windows-msvc".to_string(),
         target_endian: "little".to_string(),