AArch64: Add cost table for Cortex-A76

Add an initial cost table for Cortex-A76 - this is copied from
cotexa57_extra_costs but updated based on the Optimization Guide.
Use the new cost table on all Neoverse tunings and ensure the tunings
are consistent for all.  As a result more compact code is generated
with more combined shift+alu operations. Eg. -mcpu=cortex-a76 will now
merge the shifts in:

int f(int x, int y) { return (x & y << 3) * (x | y << 3); }

and  w2, w0, w1, lsl 3
orr  w0, w0, w1, lsl 3
mul  w0, w2, w0
ret

SPEC2017 codesize improves by 0.02% and SPECINT2017 shows 0.24% gain.

2020-11-18  Wilco Dijkstra  <wdijkstr@arm.com>

gcc/
	* config/aarch64/aarch64.c (neoversen1_tunings): Use new
	cortexa76_extra_costs.
	(neoversev1_tunings): Likewise.
	(neoversen2_tunines): Likewise.
	* config/arm/aarch-cost-tables.h (cortexa76_extra_costs):
	add new costs.