x86-64: Fix SSE2 memcmp and SSSE3 memmove for x32
Clear the upper 32 bits in RDX (memory size) for x32 to fix FAIL: string/tst-size_t-memcmp FAIL: string/tst-size_t-memcmp-2 FAIL: string/tst-size_t-memcpy FAIL: wcsmbs/tst-size_t-wmemcmp on x32 introduced by 8804157a x86: Optimize memcmp SSE2 in memcmp.S 26b24783 x86: Reduce code size of mem{move|pcpy|cpy}-ssse3 Reviewed-by:Noah Goldstein <goldstein.w.n@gmail.com> (cherry picked from commit 8ea20ee5)
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