[PATCH] Support for BIT_FIELD_REF in asan.c

[Marat Zakirov]

Hi all!

Here's a patch which instruments byte-aligned BIT_FIELD_REFs. During GCC 
asan-bootstrap and Linux kernel build I didn't find any cases where 
BIT_FIELD_REF is not 8 bits aligned. But I do not have sufficient 
confidence to replace current return if BIT_FIELD_REF is misaligned to 
assert.

Ok to commit?

--Marat
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