[PATCH GCC][5/5]Enable tree loop distribution at -O3 and above optimization levels.

[Bin Cheng]

Hi,
This patch enables -ftree-loop-distribution by default at -O3 and above optimization levels.
Bootstrap and test at O2/O3 on x86_64 and AArch64.  is it OK?

Note I don't have strong opinion here and am fine with either it's accepted or rejected.

Thanks,
bin
2017-05-31  Bin Cheng  <bin.cheng@arm.com>

	* opts.c (default_options_table): Enable OPT_ftree_loop_distribution
	for -O3 and above levels.
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