Implement a SIMD version of emulated_edge_mc() for x86.
From ~550 cycles (C version) to 170 (SSE/x86-64), 206 (MMX/x86-32) and 196 (SSE2/x86-32) cycles. (cherry picked from commit 81f2a3f4)
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From ~550 cycles (C version) to 170 (SSE/x86-64), 206 (MMX/x86-32) and 196 (SSE2/x86-32) cycles. (cherry picked from commit 81f2a3f4)