bench: refactor to use dynamic memory allocation in dasumpw

[me0-0]

Ref: #8643

Resolves : a part of #8643

Description

What is the purpose of this pull request?

This pull request:

• Refactors the C benchmark for "dasumpw" to use dynamic memory allocation as following
  double x[len];

with:

double *x;
x = (double *) malloc( len * sizeof( double ) );
...
free( x );}}

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: replace static memory allocation of large arrays in C benchmarks with dynamic memory allocation (tracking issue) #8643

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No.

Other

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No.

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Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

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• No

If you answered "yes" above, how did you use AI assistance?

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• Test/benchmark generation
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Disclosure

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{{TODO: add disclosure if applicable}}

---

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