Auto merge of #122972 - beetrees:use-align-type, r=fee1-dead

Use the `Align` type when parsing alignment attributes

Use the `Align` type in `rustc_attr::parse_alignment`, removing the need to call `Align::from_bytes(...).unwrap()` later in the compilation process.

compiler/rustc_middle/src/middle/codegen_fn_attrs.rs

@@ -1,6 +1,7 @@
 use crate::mir::mono::Linkage;
 use rustc_attr::{InlineAttr, InstructionSetAttr, OptimizeAttr};
 use rustc_span::symbol::Symbol;
+use rustc_target::abi::Align;
 use rustc_target::spec::SanitizerSet;
 
 #[derive(Clone, TyEncodable, TyDecodable, HashStable, Debug)]
@@ -42,7 +43,7 @@ pub struct CodegenFnAttrs {
     pub instruction_set: Option<InstructionSetAttr>,
     /// The `#[repr(align(...))]` attribute. Indicates the value of which the function should be
     /// aligned to.
-    pub alignment: Option<u32>,
+    pub alignment: Option<Align>,
 }
 
 #[derive(Clone, Copy, PartialEq, Eq, TyEncodable, TyDecodable, HashStable)]