r310905 - Avoid PointerIntPair of constexpr EvalInfo structs

[David Blaikie via cfe-commits]

On Mon, Aug 28, 2017 at 5:21 PM Reid Kleckner <rnk at google.com> wrote:

> On Mon, Aug 28, 2017 at 5:02 PM, David Blaikie <dblaikie at gmail.com> wrote:
>
>> Feels like this alignment attribute may be a bit of a death trap, then?
>> Should other uses of the attribute be scrutinized, or could we come up with
>> a portable way to use it safely? (using a different attribute on different
>> compilers - sounded like maybe one form worked with MSVC and a different
>> form worked with GCC? Maybe the attribute could be improved to use those as
>> appropriate?)
>>
>
> I never was able to reproduce the user issue, so I have very little
> information. I have a hard time believing that mingw32 gcc miscompiles all
> alignment attributes. There must have been something funny about our usage
> of it in ExprConstant.cpp that triggered the bug. In the unlikely case that
> we hit it again, hopefully the next user that hits the bug will provide
> more information about what went wrong.
>

Hrm - I really don't like the idea of making changes without really
understanding what's being addressed. :/

- Dave
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