[AArch64] Add --with-tune configure flag

Jeff Law law@redhat.com
Tue Nov 17 21:43:51 GMT 2020

On 11/17/20 10:53 AM, Pop, Sebastian via Gcc-patches wrote:
> Hi,
> the attached patch fixes a configure error on Arm64 when passing --with-tune=... to configure:
> ```
> This target does not support --with-tune.
> Valid --with options are: abi cpu arch
> ```
> The missing flag sets target tuning to a different value than the generic tuning.
> gcc/
>                 * config.gcc: Add --with-tune to AArch64 configure flags.
> Tested on aarch64-linux with bootstrap and regression test.
> Ok to commit to trunk and back-port to active branches?


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