libsanitizer merge from upstream r221802

[David Abdurachmanov]

Hi,

I believe this is breaking bootstrap on aarch64-linux-gnu with kernels <=3.15,
3.16 and above are fine.

__kernel_old_{gid,uid}_t were changed in 3.16 from unsigned int to unsigned
short. <=3.15 kernel will trigger static asserts in libsanitizer while
compiling GCC.

I created PR: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64435 (includes all
the details).

Attaching a patch with resolved issues on F19 + 3.12 kernel (also bootstrapped
in QEMU with F21 rootfs + 3.17 kernel) on aarch64-linux-gnu.

david

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