[PATCHv4][Kasan] Allow to override Asan shadow offset from command line

[Yury Gribov]

Hi all,

On 09/29/2014 09:21 PM, Yury Gribov wrote:
>>> Kasan developers has asked for an option to override offset of Asan
>>> shadow memory region. This should simplify experimenting with memory
>>> layouts on 64-bit architectures.
>
> New patch which checks that -fasan-shadow-offset is only enabled for
> -fsanitize=kernel-address. I (unfortunately) can't make this --param
> because this can be a 64-bit value.
>
> Bootstrapped and regtested on x64.

New patchset that adds strtoull to libiberty (blind copy-paste of 
already existing strtoul.c) and uses it to parse -fasan-shadow-offset 
(to avoid problem with compiling for 64-bit target a 32-bit host).

Bootstrapped and regtested on x64.

-Y
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