Workaround elimination with latest amdflang drop and Removing array reshapes

[anandrdbz]

Description

This PR consists of 4 major tasks:

1. Replacing older version of amdflang compiler with the latest drop
2. Ensuring all test cases pass with the new drop
3. Removing dummy variable workaround with case-optimization
4. Eliminating array reshapes for better overall simulation times

Fixes #(issue)

Type of change

• Bug fix
• New feature
• Refactor
• Documentation
• Other: describe

Testing

How did you test your changes?

Checklist

• I added or updated tests for new behavior
• I updated documentation if user-facing behavior changed

See the developer guide for full coding standards.

GPU changes (expand if you modified src/simulation/)

• GPU results match CPU results
• Tested on NVIDIA GPU or AMD GPU

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[sbryngelson]

it has merge conflicts already...

[anandrdbz]

It's a very minor conflict in CMake from a change yesterday, I will resolve it

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[codecov]

Codecov Report

❌ Patch coverage is 88.40580% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.00%. Comparing base (28863b1) to head (dbf6aec).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/simulation/m_muscl.fpp	42.85%	16 Missing ⚠️
src/simulation/m_rhs.fpp	81.25%	6 Missing and 3 partials ⚠️
src/simulation/m_viscous.fpp	76.92%	0 Missing and 3 partials ⚠️
src/simulation/m_weno.fpp	98.56%	0 Missing and 2 partials ⚠️
src/simulation/m_cbc.fpp	0.00%	0 Missing and 1 partial ⚠️
src/simulation/m_time_steppers.fpp	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1433      +/-   ##
==========================================
+ Coverage   64.95%   65.00%   +0.04%     
==========================================
  Files          72       72              
  Lines       18879    18810      -69     
  Branches     1571     1553      -18     
==========================================
- Hits        12263    12227      -36     
+ Misses       5640     5615      -25     
+ Partials      976      968       -8     

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