target/openrisc: Add support for ORFPX64A32
This is hardware support for double-precision floating-point using pairs of 32-bit registers. Fix latent bugs in the heretofore unused helper_itofd and helper_ftoid. Include the bit for cpu "any". Change the default cpu for linux-user to "any". Reviewed-by: NStafford Horne <shorne@gmail.com> Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
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