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* simplify-rtx.c (simplify_unary_operation_1) <POPCOUNT>: We can strip zero_extend, bswap and rotates from POCOUNT's argument. <PARITY>: Likewise, we can strip not, bswap, sign_extend, zero_extend and rotates from PARITY's argument. <BSWAP>: A byte-swap followed by a byte-swap is an identity. (simplify_const_unary_operation) <BSWAP>: Evaluate the byte-swap of an integer constant at compile-time. * gcc.target/i386/builtin-bswap-2.c: New test case. From-SVN: r121716
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