Enable long CL for Phi 3 recipes

[ssruti02]

Enables long CL support for the following recipes:

• Microsoft Phi-3.5-mini-instruct
• Microsoft Phi-3-mini-128k-instruct

Updates the corresponding QNN configuration files for both models.

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[Copilot]

Pull request overview

This PR aims to enable long context-length (long CL) support for the QNN optimization workflows of two Phi-3 family recipes by switching the RemoveRopeMultiCache graph surgery to use a larger cache.

Changes:

• Adds "use_large_cache": true to the RemoveRopeMultiCache surgery in the Phi-3.5 Mini Instruct QNN config.
• Adds "use_large_cache": true to the RemoveRopeMultiCache surgery in the Phi-3 Mini 128k Instruct QNN config.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
microsoft-Phi-3.5-mini-instruct/QNN/x_elite_config.json	Enables large RoPE cache in the graph surgery configuration (intended to support long CL).
microsoft-Phi-3-mini-128k-instruct/QNN/config.json	Enables large RoPE cache in the graph surgery configuration (intended to support long CL).

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