Correct the description of check_cpu()
check_cpu() turns on SSE instructions by clearing bit 15 of HWCR MSR on legacy AMD processors. Refer to "MSRC001_0015 Hardware Configuration (HWCR)" of BIOS and Kernel Developer Guide (BKDG) for AMD Family 14h Models 00h-0Fh Processors [1]. [1] https://www.amd.com/system/files/TechDocs/43170_14h_Mod_00h-0Fh_BKDG.pdfpull/822/head
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