Re: libsanitizer merge from upstream r208536

[Konstantin Serebryany]

>> 2) it doesn't still deal with unaligned power of two accesses properly,
>>    but neither does llvm (at least not 3.4).  Am not talking about
>>    undefined behavior cases where the compiler isn't told the access
>>    is misaligned, but e.g. when accessing struct S { int x; }
>>    __attribute__((packed)) and similar (or aligned(1)).  Supposedly
>>    we could force __asan_report_*_n for that case too, because
>>    normal wider check assumes it is aligned
>
> Yep, we don't do it.
Now we do: http://llvm.org/viewvc/llvm-project?rev=209508&view=rev