[Static Runtime] Added a variable for clamp in the NNC code for Logit. (#63839)

[Static Runtime] Added a variable for clamp in the NNC code for Logit. (#63839)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63839

Replaced the use of a constant for clamp in the NNC code for Logit
with a variable. This makes it easier to enable caching for Logit.

There is no performance difference with this change, as shown in the micro-benchmarks below.

```
Logit NNC Benchmark	Time (ns)
	           const-clamp	var-clamp
logit_nnc_sleef/64	550	543
logit_nnc_sleef/512	3514	3517
logit_nnc_sleef/8192	85537	82900
logit_nnc_sleef/32768	347635	337016
logit_nnc_fast/64	173	167
logit_nnc_fast/512	829	866
logit_nnc_fast/8192	13286	13069
logit_nnc_fast/32768	51116	53429
logit_nnc_vml/64	146	164
logit_nnc_vml/512	773	783
logit_nnc_vml/8192	11556	11563
logit_nnc_vml/32768	44815	46720
```

Test Plan: SR unit tests and the inline_cvr model.

Reviewed By: bertmaher

Differential Revision: D30405466

fbshipit-source-id: adb891fdae5746439931ce5f43165291fec08f52