backport: re PR target/59593 ([arm big-endian] using "ldrh" access a immediate ...

backport: re PR target/59593 ([arm big-endian] using "ldrh" access a  immediate  which stored in a memory by word)

       Backport from mainline
       2014-11-20  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>

       PR target/59593
       * config/arm/arm.md (*movhi_insn): Use right formatting
       for immediate.

       2014-11-19  Felix Yang  <felix.yang@huawei.com>
                   Shanyao Chen  <chenshanyao@huawei.com>

       PR target/59593
       * config/arm/arm.md (define_attr "arch"): Add v6t2.
       (define_attr "arch_enabled"): Add test for the above.
       (*movhi_insn_arch4): Add new alternative.

From-SVN: r218376