[Ping][GCC][IRA] Revert 11b8091fb to fix Bug 93221

[Joel Hutton]

On 28/01/2020 09:07, Eric Botcazou wrote:
>> Ping! Eric, do you have any objections to reverting?
>
> See my comment posted in the audit trail of the TN on 01/20...

> Probably missing live range splitting or somesuch, as envisioned by
> Vladimir in its approval message.  Feel free to eventually revert it.

Great. Vladimir, Ok for trunk?

Changelog:

2020-01-21  Joel Hutton  <Joel.Hutton@arm.com>

         PR target/93221
         * ira.c (ira): Revert use of simplified LRA algorithm.

gcc/testsuite/ChangeLog:

2020-01-21  Joel Hutton  <Joel.Hutton@arm.com>

         PR target/93221
         * gcc.target/aarch64/pr93221.c: New test.
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