Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
; RUN: llc < %s define i64 @test(i64 %A) { %B = trunc i64 %A to i8 ; <i8> [#uses=1] %C = sext i8 %B to i64 ; <i64> [#uses=1] ret i64 %C }