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Revert "stage2 llvm: Use unpacked struct for unions and arrays"

This reverts commit 2eaef84ebe968224b0cf25206abf12ea1c5e0f5a.

Here is a motivating example:

```zig
const E = union(enum) {
    A: [9]u8,
    B: u64,
};
```

```llvm
%test2.E = type { { i64, [1 x i8] }, i1, [6 x i8] }
```

```
error(codegen): when lowering test2.E, Zig ABI size = 16 but LLVM ABI size = 24
```
8c14d170b5Andrew Kelley committed on 7/15/2022, 5:26:11 AMparent9c136be
1 file changedLine totals unavailable