s390x: Support aligned stack datalayout

LLVM 23 will mark the stack as aligned for more efficient code:

llvm/llvm-project#176041

Author: maurer

compiler/rustc_codegen_llvm/src/context.rs

@@ -216,6 +216,12 @@ pub(crate) unsafe fn create_module<'ll>(
             target_data_layout = target_data_layout.replace("-f64:32:64", "");
         }
     }
+    if llvm_version < (23, 0, 0) {
+        if sess.target.arch == Arch::S390x {
+            // LLVM 23 updated the s390x layout to specify the stack alignment: https://github.com/llvm/llvm-project/pull/176041
+            target_data_layout = target_data_layout.replace("-S64", "");
+        }
+    }
 
     // Ensure the data-layout values hardcoded remain the defaults.
     {

compiler/rustc_target/src/spec/targets/s390x_unknown_linux_gnu.rs

@@ -22,7 +22,7 @@ pub(crate) fn target() -> Target {
             std: Some(true),
         },
         pointer_width: 64,
-        data_layout: "E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-v128:64-a:8:16-n32:64".into(),
+        data_layout: "E-S64-m:e-i1:8:16-i8:8:16-i64:64-f128:64-v128:64-a:8:16-n32:64".into(),
         arch: Arch::S390x,
         options: base,
     }

compiler/rustc_target/src/spec/targets/s390x_unknown_linux_musl.rs

@@ -23,7 +23,7 @@ pub(crate) fn target() -> Target {
             std: Some(true),
         },
         pointer_width: 64,
-        data_layout: "E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-v128:64-a:8:16-n32:64".into(),
+        data_layout: "E-S64-m:e-i1:8:16-i8:8:16-i64:64-f128:64-v128:64-a:8:16-n32:64".into(),
         arch: Arch::S390x,
         options: base,
     }