* fix compile issues introduced by loongarch_asx
* restore quant changes to merge
* fix compile issues introduced by loongarch_asx
* further optimize by using vec_msum & vec_sum4s on ppc64le
* optimize for ppc64le using VSX intrinsics
* 1. code clean up by removing comments about overflow concern.
2. fix typo in suffix of scaling.
* Continue to fix typo in suffix of scaling for QK_K <> 256
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Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>