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Details: - Allow building BLIS with certain framework files (each with the '_amd' suffix) that have been customized by AMD for Zen-based hardware. These customized files were derived from portable versions of the same files (i.e., those without the '_amd' suffix). Whether the portable or AMD- specific files are compiled is now controlled by a new configure option, --[en|dis]able-amd-frame-tweaks. This option is disabled by default in vanilla BLIS, though AMD may choose to enable it by default in their fork. For now, the added AMD-specific files are: - bli_gemv_unf_var2_amd.c - bla_copy_amd.c - bla_gemv_amd.c These files reside in 'amd' subdirectories found within the directory housing their generic counterparts. - Register optimized real-domain copyv, setv, and swapv kernels in bli_cntx_init_zen.c. - Various minor updates to level-1v kernels in 'zen' kernel set. - Added caxpyf kernel as well as saxpyf and multiple daxpyf kernels to the 'zen' kernel set - If the problem passed to ?gemm_() in bla_gemm.c has a unit m or n dim, call gemv instead and return early. - Combined variable declarations with their initialization in various level-2 and level-3 BLAS compatibility files, and also inserted 'const' qualifer in those same declaration statements. - Moved frame/compat/bla_gemmt.c and .h to frame/compat/extra/ . - Added copyv and swapv test drivers to 'test' directory. - Whitespace, comment changes.