ObjFW runtime: Add objc_msg_lookup(_super)_{fp,st}ret

[Jonathan Schleifer]

Am 11.07.2013 um 03:46 schrieb Eli Friedman:

> It's returned in a different kind of temporary, so the ABI code
> doesn't consider it "stret".

But it's not passed as an argument before all other arguments, like with stret, thus not going to crash when the normal forwarding routine is used?

> Missing documentation patch for the __has_feature.  Also, not sure I
> like the name; can you try for something more descriptive?

I can't really think of a more descriptive name :/. IMHO, it is pretty descriptive:
 * objc_ tells you it's an objc feature
 * msg_lookup tells you it's message lookup related
 * stret tells you it supports struct return
 * together it tells you that objc supports lookup for struct return

Do you have suggestions for something better?

> You can combine the two tests into one using FileCheck's -check-prefix flag.

I tried that, but it doesn't work. The second test fails to even recognize something as simple as define void @test0(). Can you please have a look at the attached test?
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Jonathan