[webkit-dev] Heads up: Handling many minor CPUs as CPU(UNKNOWN)

[Yusuke SUZUKI]

Hello WebKittens,

I've just landed the patch[1] introducing CPU(UNKNOWN) and dropping many
minor CPUs.

CPU(UNKNOWN) is a conservative CPU which handles uknown CPUs. It allows
minor CPUs
incuding future CPUs to build WebKit without adding a new CPU types to
source code.
And this cleans up source code much by dropping many minor CPUs.

Dropped minor CPUs are ALPHA, HPPA, IA64, SH4, S390X, and S390.
If you are maintaining one of them and encounter some failures, please open
a bug for that.
CPU(UNKNOWN) should keep them working.

Best regards,
Yusuke Suzuki

[1]: https://trac.webkit.org/r225040
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