Add an implementation of IRIX-compatible cacheflush() routine to mips ports,
needed for gcc -ftrampoline operation as well as by some third-party
software.
Although the implementation uses the sysarc

Add an implementation of IRIX-compatible cacheflush() routine to mips ports,
needed for gcc -ftrampoline operation as well as by some third-party
software.
Although the implementation uses the sysarch() sysctl, the wrapper is
added to libc as it was a direct system call (which it is on IRIX).

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