llgo: xgo-dev

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[fennoai]

Review: replace goplus/llgo with xgo-dev/llgo

No blocking issues found. The change is a clean, complete find-and-replace of the LLGo module path, and I confirmed it is consistent across the repository.

Verified

• All three occurrences updated: README.md:13 (compiler link) and the two //go:linkname directives at rtype_llgo.go:139 and rtype_llgo.go:379.
• A repo-wide search for goplus/llgo returns zero remaining references, so nothing was missed.
• linkname_go121.go:13 also declares an interequal linkname, but it targets the standard runtime.interequal under the !llgo build tag — correctly left unchanged.
• go.mod is rightly untouched: the xgo-dev/llgo path appears only in //go:linkname directives (resolved at LLGo link time under the //go:build llgo tag) and a doc link, so it is not a tracked module dependency.

Non-blocking note (informational)

• The two //go:linkname directives now pull unexported runtime symbols (interequal, DirectIfaceData) from a different GitHub org (xgo-dev vs goplus). Because these are cross-module pull-linknames into an internal/ runtime package, correctness depends on the target keeping identical signatures/ABI, and the linkage is not pinned by go.sum. If xgo-dev/llgo is the sanctioned successor home of LLGo in the XGo ecosystem, this is a benign rename — worth a quick confirmation of the new repo's ownership/governance before merging.