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feat(ck): Add gfx90c build support ## Motivation Needed for https://github.com/ROCm/TheRock/issues/3818. ## Technical Details When building torch w/ TheRock CI (`build_prod_wheels.py`) on gfx90c, was running into the generic error below compiling `amd_buffer_addressing_builtins.hpp` ``` composable_kernel/include/ck/utility/amd_buffer_addressing_builtins.hpp:33:48: error: use of undeclared identifier 'CK_BUFFER_RESOURCE_3RD_DWORD' ...:61:22: error: use of undeclared identifier 'CK_BUFFER_RESOURCE_3RD_DWORD' ...:73:22: error: use of undeclared identifier 'CK_BUFFER_RESOURCE_3RD_DWORD' 4 errors generated when compiling for gfx90c. ``` Adding `__gfx90c__` to the arch definition list resolves this. ## Test Plan Build torch (`build_prod_wheels.py`) for gfx90c before and after patch. ## Test Result - Before: Fails with `amd_buffer_addressing_builtins.hpp:33:48: error: use of undeclared identifier 'CK_BUFFER_RESOURCE_3RD_DWORD'` - After: Build passes ## Submission Checklist - [ ] Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.