[Issue 23081] New: align(N) attribute ignored for ClassDeclarations

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23081

          Issue ID: 23081
           Summary: align(N) attribute ignored for ClassDeclarations
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: kinke at gmx.net

`align(N) class C {}` has no effect at all. I'd expect the following behavior:

```
align(64) class AlignedClass { int field; }

static assert(AlignedClass.field.offsetof == 2 * size_t.sizeof); // vtbl,
monitor
static assert(__traits(classInstanceAlignment, AlignedClass) == 64);
static assert(__traits(classInstanceSize, AlignedClass) == 2 * size_t.sizeof +
4);
```

See https://github.com/dlang/dmd/pull/14063#issuecomment-1115059532 for an
implementation idea.

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