syscall: use SYS_GETDENTS64 on linux/mips64{,le}
The getdents64 syscall is only available for mips64/mips64le starting with Linux kernel 3.10. Since mips64le requires at least 4.8 according to [1] (regarding #16848) using it should be fine. [1] https://golang.org/wiki/MinimumRequirements This CL changes the binary layout of type Dirent for mips64/mips64le, but not the public API. But since the currently used layout doesn't match the struct linux_dirent returned by the getdents syscall this should be fine as well. Fixes #23624 Change-Id: Iaa7306fa6e4442ad2fed41c60b37627a7314f117 Reviewed-on: https://go-review.googlesource.com/91055Reviewed-by:Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by:
Cherry Zhang <cherryyz@google.com>
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