Sema: preserve alignment of const decl pointers

Closes #12769

src/Sema.zig

@@ -26005,6 +26005,7 @@ fn analyzeDeclRef(sema: *Sema, decl_index: Decl.Index) CompileError!Air.Inst.Ref
             .pointee_type = decl_tv.ty,
             .mutable = false,
             .@"addrspace" = decl.@"addrspace",
+            .@"align" = decl.@"align",
         }),
         try Value.Tag.decl_ref.create(sema.arena, decl_index),
     );

test/behavior/pointers.zig

@@ -486,3 +486,14 @@ test "array slicing to slice" {
     try S.doTheTest();
     comptime try S.doTheTest();
 }
+
+test "pointer to constant decl preserves alignment" {
+    const S = struct {
+        a: u8,
+        b: u8,
+        const aligned align(8) = @This(){ .a = 3, .b = 4 };
+    };
+
+    const alignment = @typeInfo(@TypeOf(&S.aligned)).Pointer.alignment;
+    try std.testing.expect(alignment == 8);
+}