internal/buildcfg: enable register ABI for PPC64
This enables the new register ABI for all PPC64 targets
by default including linux/ppc64, linux/ppc64le, and aix/ppc64.
Improvements with the new register ABI on a power9:
name old time/op (ns/op) new time/op (ns/op) delta
BinaryTree17
3882070000 3274900000 -15.64%
Fannkuch11
3787620000 3614740000 -4.56%
FmtFprintfEmpty 58.705 51.1875 -12.81%
FmtFprintfString 101.675 94.4725 -7.08%
FmtFprintfInt 112.725 104.075 -7.67%
FmtFprintfIntInt 166.475 158.05 -5.06%
FmtFprintfPrefixedInt 183.7 178.975 -2.57%
FmtFprintfFloat 246.55 258.8 +4.97%
FmtManyArgs 648.325 665.875 +2.71%
GobDecode
8004660 6802210 -15.02%
GobEncode
7289780 5675710 -22.14%
Gzip
326931000 323586000 -1.02%
Gunzip
47544700 37808000 -20.48%
HTTPClientServer 46927.2 42357.8 -9.74%
JSONEncode
12098300 9621450 -20.47%
JSONDecode
62305300 55410200 -11.07%
Mandelbrot200
5841540 5934590 +1.59%
GoParse
5594880 4003360 -28.45%
RegexpMatchEasy0_32 96.185 89.6325 -6.81%
RegexpMatchEasy0_1K 255.775 210.45 -17.72%
RegexpMatchEasy1_32 102.95 93.8825 -8.81%
RegexpMatchEasy1_1K 511.65 385.075 -24.74%
RegexpMatchMedium_32 1414.75 1236.75 -12.58%
RegexpMatchMedium_1K 42114.5 37022.5 -12.09%
RegexpMatchHard_32 2110.5 1901.5 -9.90%
RegexpMatchHard_1K 63559.5 59494 -6.40%
Revcomp
532981000 480640000 -9.82%
Template
81903600 65743300 -19.73%
TimeParse 310.75 276.525 -11.01%
TimeFormat 483.4 355.475 -26.46%
Change-Id: Ib7c5dfe8ddc2f17050943912048f55667dabde39
Reviewed-on: https://go-review.googlesource.com/c/go/+/353969
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>