Enable NNPA saturation by default and change the option to --nnpa-disable-saturation

[tungld]

This patch enables NNPA saturation by default to avoid out of range errors in running some models.
The performance penalty is quite small, for example, for roberta base:

Without saturation:

  Statistics 1 (excluding warmup), min, 8.873799e-01, max, 9.775084e-01, mean, 9.113163e-01, stdev, 1.960276e-02
  Statistics 2 (no warmup/quart.), min, 8.993821e-01, max, 9.181984e-01, mean, 9.091503e-01, stdev, 5.989598e-03

With saturation:

  Statistics 1 (excluding warmup), min, 8.923542e-01, max, 9.461253e-01, mean, 9.196692e-01, stdev, 1.480647e-02
  Statistics 2 (no warmup/quart.), min, 9.126368e-01, max, 9.281075e-01, mean, 9.210191e-01, stdev, 5.047690e-03

[chentong319]

What if we change the attribute from "saturation" to "nonsaturation"? Will that save some modifications in the test case and code gen?

[chentong319]

LGTM!

[tungld]

What if we change the attribute from "saturation" to "nonsaturation"? Will that save some modifications in the test case and code gen?

Looks a good idea. Let me give it a try. Thanks!

[tungld]

@jenkins-droid test this please

[Sunny-Anand]

@jenkins-droid test this please

[tungld]

@jenkins-droid test this please

[tungld]

What if we change the attribute from "saturation" to "nonsaturation"? Will that save some modifications in the test case and code gen?

@chentong319 I changed "saturation" to nosaturation". Thanks!

[jenkins-droid]

Jenkins Linux ppc64le Build #15390 [push] Enable NNPA saturation b... started at 00:22

[jenkins-droid]

Jenkins Linux s390x Build #16409 [push] Enable NNPA saturation b... started at 00:09

[jenkins-droid]

Jenkins Linux amd64 Build #16407 [push] Enable NNPA saturation b... started at 23:09

[jenkins-droid]

Jenkins Linux amd64 Build #16407 [push] Enable NNPA saturation b... passed after 1 hr 38 min

[jenkins-droid]

Jenkins Linux s390x Build #16409 [push] Enable NNPA saturation b... passed after 2 hr 2 min

[jenkins-droid]

Jenkins Linux ppc64le Build #15390 [push] Enable NNPA saturation b... aborted after 2 hr 27 min