Auto merge of #81234 - repnop:fn-alignment, r=lcnr

Allow specifying alignment for functions

Fixes #75072

This allows the user to specify alignment for functions, which can be useful for low level work where functions need to necessarily be aligned to a specific value.

I believe the error cases not covered in the match are caught earlier based on my testing so I had them just return `None`.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/test/codegen/align-fn.rs b/src/test/codegen/align-fn.rs
new file mode 100644
index 00000000000..c5886cf2808
--- /dev/null
+++ b/src/test/codegen/align-fn.rs
@@ -0,0 +1,9 @@
+// compile-flags: -C no-prepopulate-passes -Z mir-opt-level=0
+
+#![crate_type = "lib"]
+#![feature(fn_align)]
+
+// CHECK: align 16
+#[no_mangle]
+#[repr(align(16))]
+pub fn fn_align() {}