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PPC buildfix heading upstream, no need to merge.

Justin M. Forbes requested to merge jmflinuxtx/kernel-ark:ppc-6.3-buildfix into os-build

With appropriate compiler support [1], KASAN builds use __asan prefixed meminstrinsics, and KASAN no longer overrides memcpy/memset/memmove.

If compiler support is detected (CC_HAS_KASAN_MEMINTRINSIC_PREFIX), define memintrinsics normally (do not prefix '__').

On powerpc, KASAN is the only user of __mem functions, which are used to define instrumented memintrinsics. Alias the normal versions for KASAN to use in its implementation.

Link: https://lore.kernel.org/all/20230224085942.1791837-1-elver@google.com/ [1] Link: https://lore.kernel.org/oe-kbuild-all/202302271348.U5lvmo0S-lkp@intel.com/ Reported-by: kernel test robot lkp@intel.com Signed-off-by: Marco Elver elver@google.com Acked-by: Michael Ellerman mpe@ellerman.id.au (powerpc)

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