[AArch64 costs 18/18] Dump a message if we are unable to cost an insn.

[James Greenhalgh]

Hi,

If we are unable to fully cost an RTX, we should return the default
cost and avoid recursing to the operands. This will bias us towards
picking "bigger" RTX - which presumably have been added as patterns
because somebody expects them to be more efficient.

To aid future debugging and development, we also dump our shortcomings.

Tested on aarch64-none-elf with no issues.

OK for 5.0?

Thanks,
James

---
2014-03-27  James Greenhalgh  <james.greenhalgh@arm.com>

	* config/aarch64/aarch64.c (aarch64_rtx_costs): Handle the case
	where we were unable to cost an RTX.
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