[AArch64] Restore recog state after finding pre-madd instruction

    * config/aarch64/aarch64.c (aarch64_madd_needs_nop): Restore
    recog state after aarch64_prev_real_insn call.

    * gcc.target/aarch64/madd_after_asm_1.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_8-branch@216854 138bc75d-0d04-0410-961f-82ee72b054a4