Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
; RUN: opt < %s -passes=sccp -disable-output ; PR4277 define i32 @main() nounwind { entry: %0 = tail call signext i8 (...) @sin() nounwind ret i32 0 } declare signext i8 @sin(...)