Fix TENO performance

[ChrisZYJ]

Description

Fixes a performance issue in TENO-5/7 on CPUs that cannot optimize **6._wp. GPU performance is unaffected.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Scope

• This PR comprises a set of related changes with a common goal

How Has This Been Tested?

Relative speeds (CPU and GPU speeds normalized with respect to their respective WENO3-JS):

Absolute speeds (ns/gp/eq/rhs):

	CPU	GPU
3J	8.02	1.73
3M	9.96	2.64
3Z	7.88	1.74
5J	9.82	2.29
5M	12.84	3.63
5Z	9.51	2.31
5T	9.91	2.60
7J	12.19	3.07
7M	16.18	4.87
7Z	11.47	3.14
7T	15.79	3.99
5T before	28.51	2.61
7T before	54.92	4.00

Legends:

• 3/5/7: order
• J: WENO-JS
• M: WENO-M
• Z: WENO-Z
• T: TENO

Configuration:

• 3D_performance_test
• CPU tests on Richardson using 32 cores on one "rm" node
• GPU tests on Delta using one GPU on one A40x4 node

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.66%. Comparing base (e3572d1) to head (8b8926e).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #807   +/-   ##
=======================================
  Coverage   43.65%   43.66%           
=======================================
  Files          65       65           
  Lines       19157    19159    +2     
  Branches     2338     2338           
=======================================
+ Hits         8363     8365    +2     
  Misses       9370     9370           
  Partials     1424     1424           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[sbryngelson]

Excellent PR. Thanks @ChrisZYJ. Merging.