[PATCH] Improve fix for PR21476 (sanitizer_common not building on AArch64 with <=3.15 kernels)

[Evgeniy Stepanov]

LGTM, but please disable the definitions of __kernel_old_*_t on 32-bit platforms in sanitizer_platform_limits_posix.h as well.


http://reviews.llvm.org/D6854

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