PATH: Simplify SSE intrinsics with 3 args

[H.J. Lu]

Hi,

ix86_expand_sse_4_operands_builtin can expand SSE insns with
4 operands. This patch uses it to implement __builtin_ia32_shufps
and __builtin_ia32_shufpd. Also there is no need to define
__builtin_ia32_roundsd nor __builtin_ia32_roundss separately.
Tested on Linux/Intel64. OK to install?

Thanks.


H.J.
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