[PATCH] Use ECF_MAY_BE_ALLOCA for __builtin_alloca_with_align (PR tree-optimization/68680)

[Eric Botcazou]

> Does the patch mean we inlined __builtin_alloca_with_align ()
> functions?  We might run into the issue Eric fixed lately with
> mixing alloca and VLAs (don't see the patch being committed though).

But I'm about to do it (I was waiting for the approval of the aarch64 
specific part).  Note that I'm not really sure if we want it for 5.x too.

-- 
Eric Botcazou