[Patch AArch64] Add cpu_defines.h for AArch64.

[Ramana Radhakrishnan]

Hi,

Like the ARM port, the AArch64 ports needs to set glibc_integral_traps 
to false as integer divide instructions do not trap.

Bootstrapped and regression tested on aarch64-none-linux-gnu

Ok to apply ?

regards
Ramana


2015-05-17  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>

         * configure.host: Define cpu_defines_dir for AArch64
         * config/cpu/aarch64/cpu_defines.h: New file.
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