[RFC PATCHES] Obsolete or remove powerpc*-*-*spe* support (PR target/81084)

[Jakub Jelinek <jakub at redhat dot com>]

Hi!

In the http://gcc.gnu.org/ml/gcc/2017-02/msg00041.html
thread it has been proposed that powerpc*-*-*spe* would be obsoleted in
GCC 7, which didn't happen and the rs6000 backend has been split into two,
one actively maintained where the SPE support has been removed, and the
other one which unfortunately had just a few small commits, didn't get rid
of the expected 80% of the new backend which would make it deal with it
for global changes in GCC, nor has the bugfixes added to rs6000 backend in
the last 11 months since the split (many of them apply to powerpcspe too).

So, in order to resolve the P1 PR81084, I think we should at least make the
powerpc*-*-*spe* obsolete for GCC 8 and remove in GCC 9 if it doesn't get
significantly better soon (the first patch), or remove it altogether now,
which would match the deal that either the port is cleaned up, or it is
removed (the second patch).  In addition to this some changes.html
changes will be needed depending on what is chosen.

Preferences on what to do?

	Jakub

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