[ARM 2/5 big.LITTLE] Allow tuning parameters without unique tuning targets.
gcc/
* config/arm/arm-cores.def: Add new column for TUNE_IDENT.
* config/arm/genopt.sh: Improve layout.
* config/arm/arm-tune.md: Regenerate.
* config/arm/arm-tables.opt: Regenerate.
* config/arm/arm-opts.h (ARM_CORE): Modify macro for TUNE_IDENT.
* config/arm/arm.c (ARM_CORE): Modify macro for TUNE_IDENT.
(arm_option_override): When a CPU is chosen, that should also
form the tune target.
* config/arm/arm.h (ARM_CORE): Modify macro for TUNE_IDENT.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@206046 138bc75d-0d04-0410-961f-82ee72b054a4