update AITER_ASM_DIR

[amd-ruitang3]

Motivation

Technical Details

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Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[Copilot]

Pull request overview

This PR updates the AITER_ASM_DIR environment variable to point to a base path without the architecture name, then dynamically appends the architecture name using the get_gpu_arch() function. This change makes the configuration more flexible by automatically selecting the correct architecture-specific subdirectory at runtime.

Changes:

• Updated AITER_ASM_DIR path structure to remove hardcoded architecture name
• Modified C++ code to dynamically construct architecture-specific paths using get_gpu_arch()
• Updated documentation to reflect the new path structure

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
op_tests/cpp/mha/README.md	Updated documentation to remove {arch_name}/ from the AITER_ASM_DIR export example
csrc/py_itfs_cu/asm_fmoe.cu	Modified FMoeKernel constructor to dynamically build path with architecture name
csrc/include/aiter_hip_common.h	Updated AiterAsmKernel constructor to dynamically build path with architecture name, added forward declaration of get_gpu_arch()
aiter/jit/core.py	Simplified AITER_ASM_DIR definition to base path without architecture subdirectory

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