Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

2009-07-02-MaskedIntVector.ll
; RUN: opt < %s -passes=instcombine | llvm-dis
; PR4495

define i32 @test(i64 %test) {
entry:
	%0 = bitcast <4 x i32> undef to <16 x i8>		; <<16 x i8>> [#uses=1]
	%t12 = shufflevector <16 x i8> %0, <16 x i8> zeroinitializer, <16 x i32> <i32 0, i32 16, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0, i32 0>		; <<16 x i8>> [#uses=1]
	%t11 = bitcast <16 x i8> %t12 to <2 x i64>		; <<2 x i64>> [#uses=1]
	%t9 = extractelement <2 x i64> %t11, i32 0		; <i64> [#uses=1]
	%t10 = bitcast i64 %t9 to <2 x i32>		; <<2 x i32>> [#uses=1]
	%t7 = bitcast i64 %test to <2 x i32>		; <<2 x i32>> [#uses=1]
	%t6 = xor <2 x i32> %t10, %t7		; <<2 x i32>> [#uses=1]
	%t1 = extractelement <2 x i32> %t6, i32 0		; <i32> [#uses=1]
	ret i32 %t1
}