powerpc: Fix IFUNC for memrchr
Recent commit 59ba2d2b missed to add __memrchr_power8 in ifunc list. Also handled discarding unwanted bytes for unaligned inputs in power8 optimization. 2017-10-05 Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> * sysdeps/powerpc/powerpc64/multiarch/memrchr-ppc64.c: Revert back to powerpc32 file. * sysdeps/powerpc/powerpc64/multiarch/memrchr.c (memrchr): Add __memrchr_power8 to ifunc list. * sysdeps/powerpc/powerpc64/power8/memrchr.S: Mask extra bytes for unaligned inputs.
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