[PATCH] LRA: Fix caller-save store/restore instruction for large mode

[Kito Cheng]

Hi Vladimir:
  This patch has a discusses with you in May 2014, this patch is about
the caller-save register store and restore instruction generation, the
current LRA implementation will miss caller-save store/restore
instruction if need one more instruction.

You said you will investigate for this on IRC, so I don't send the
patch last year, however ARM guys seem got this problem too, so I
think it's time to send this patch :)

ChangeLog

2015-01-05  Kito Cheng  <kito@0xlab.org>

        * lra-constraints.c (split_reg): Fix caller-save store/restore
instruction generation.
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