[PATCH/AARCH64] Add -mcpu=thunderx2t99 support

[Andrew Pinski <pinskia at gmail dot com>]

Hi,
  This patch adds -mcpu=thunderx2t99.  Cavium has acquired the Vulcan
IP from Broadcom.  I am keeping the old -mcpu=vulcan as backwards
compatible but renaming all of the structures to be based on the new
name of the chip.  In the next few weeks, I am auditing the current
tuning and will be posting some changes too.

OK?  Bootstrapped and tested on aarch64-linux-gnu with no regressions.
Also tested -mcpu=native on a ThunderX2 CN99xx machine.

Thanks,
Andrew

ChangeLog:
* config/aarch64/aarch64-cores.def: Add thunderx2t99.  Change vulcan
to reference thunderx2t99 for the tuning structure
* config/aarch64/aarch64-cost-tables.h (vulcan_extra_costs): Rename to ...
(thunderx2t99_extra_costs): This.
* config/aarch64/aarch64-tune.md: Regenerate.
* config/aarch64/aarch64.c (vulcan_addrcost_table): Rename to ...
(vulcan_addrcost_table): This.
(vulcan_regmove_cost): Rename to ...
(thunderx2t99_regmove_cost): This.
(vulcan_vector_cost): Rename to ...
(thunderx2t99_vector_cost): this.
(vulcan_branch_cost): Rename to ...
(thunderx2t99_branch_cost): This.
(vulcan_tunings): Rename to ...
(thunderx2t99_tunings): This and s/vulcan/thunderx2t99 .
* doc/invoke.texi (AARCH64/mtune): Add thunderx2t99.

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