go-llvm: add PHI incoming block replacement - #5
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Summary
PHINode::replaceIncomingBlockWiththrough the additional C bindingsValue.ReplaceIncomingBlock(old, new)to the Go APIThis is the minimal binding needed by goallc/go#38 to split nilcheck CFG blocks after normal PHI construction without rebuilding PHI nodes.
Validation
go test -tags="llvm23 dynamicllvm" -count=1 ./...gofmtgit diff --check