Windows ASan: Allow 9-byte nops as hotpatch padding

[Reid Kleckner via llvm-commits]

Belatedly committed in r310419, thanks for the patch!

On Tue, Jul 25, 2017 at 3:45 PM, David Major via llvm-commits <
llvm-commits at lists.llvm.org> wrote:

> This patch makes the 9-byte variant of hint-nop be considered valid
> padding for the hotpatch interception technique.
>
> This is needed in order to safely patch ntdll!strcpy in the Windows 10
> Creators Update, which has a branch target as its fourth byte. With a
> hotpatch we only need to clobber the first two bytes of the function body
> and can leave the branch target intact.
>
> Fixes https://github.com/google/sanitizers/issues/829
>
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