[ARM 2/5 big.LITTLE] Allow tuning parameters without unique tuning targets.

[James Greenhalgh]

Hi,

A limitation in the ARM backend is that each core added to arm-cores.def
must provide a unique identifier to be used for tuning. This restricts
us when we want to share the same identifier between a number of cores.

The machinery here is a bit messy, and we don't really make it any nicer
in this patch. But, this change does allow you to add core names which
use other tuning targets easily.

This, for example allows us to wire up -mcpu=cortex-a15.cortex-a7 to
use the scheduler description for Cortex-A7 without requiring
modifications to the Cortex-A7 scheduler description.

Bootstrapped in series and checked on arm-none-linux-gnueabi and
arm-none-eabi.

OK?

Thanks,
James

---
gcc/

2013-12-17  James Greenhalgh  <james.greenhalgh@arm.com>

	* 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.
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