My previous change to the Cortex-A53 scheduler resulted in a 13% regression on a...

My previous change to the Cortex-A53 scheduler resulted in a 13% regression on a proprietary benchmark.

My previous change to the Cortex-A53 scheduler resulted in a 13% regression on a
proprietary benchmark.  This turned out to be due to non-optimal scheduling of int
to float conversions.  This patch separates int to FP transfers from int to float
conversions based on experiments to determine the best schedule.  As a result of
these tweaks the performance of the benchmark improves by 20%.

    gcc/
	* config/arm/cortex-a53.md: Add bypasses for
	cortex_a53_r2f_cvt.
	(cortex_a53_r2f): Only use for transfers.
	(cortex_a53_f2r): Likewise.
	(cortex_a53_r2f_cvt): Add reservation for conversions.
	(cortex_a53_f2r_cvt): Likewise.

From-SVN: r244322