chore: improve fork comment and use v0.12.2-preview llgo tag#8

xgopilot[bot] wants to merge 1 commit intollcppg-compile-with-llgoluoliwoshang/llcppg:llcppg-compile-with-llgofrom

fork-pr-653-1771053887luoliwoshang/llcppg:fork-pr-653-1771053887Copy head branch name to clipboard