[Bug sanitizer/77567] ASAN: Bugus error "alloc-dealloc-mismatch (malloc vs operator delete [])" with C++17's over-aligned types

[kcc at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77567

--- Comment #6 from Kostya Serebryany <kcc at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #5)
> Created attachment 39612 [details]
> pr77567-2.patch
> 
> Slightly larger patch, which attempts to diagnose that, but fails to do so,
> because asan_allocator.cc only has:
>   u32 alloc_type        : 2;
> and we now need 3 bits instead of just 2.
> Dmitry, is there any possibility to free one bit for this in ChunkHeader?

There are no bits left. 
But do we need these new states here? 
Can't we reuse the from_memalign field? 

Also, please remember that we can not accept patches from this buganizer --
they need to go via http://llvm.org/docs/Phabricator.html