[AARCH64][PR63424][4.9]Backport "Fix PR63424 by adding <su><maxmin>v2di3 pattern"

[Renlin Li]

Hi all,

This is a backport patch to fix PR63424. The previous change in trunk is 
here: https://gcc.gnu.org/ml/gcc-patches/2014-10/msg03306.html
and commit log is here: 
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=217786

aarch64-none-elf toolchain has been tested on the model, no regressions.

Is it Okay for branch 4.9?

gcc/ChangeLog:

2014-11-19 Renlin Li <renlin.li@arm.com>
     PR target/63424
     * config/aarch64/aarch64-simd.md (<su><maxmin>v2di3): New.

gcc/testsuite/ChangeLog:

2014-11-19 Renlin Li <renlin.li@arm.com>
     PR target/63424
     * gcc.target/aarch64/pr63424.c: New Test.

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