Windows ASan: Allow 9-byte nops as hotpatch padding

[David Major via llvm-commits]

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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