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Duncan P. N. Exon Smith 7838818ad7 IR: Implement uselistorder assembly directives

Implement `uselistorder` and `uselistorder_bb` assembly directives,
which allow the use-list order to be recovered when round-tripping to
assembly.

This is the bulk of PR20515.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216025 91177308-0d34-0410-b5e6-96231b3b80d8

2014-08-19 21:30:15 +00:00

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 ; RUN: not llvm-as < %s -disable-output 2>&1 | FileCheck %s
 ; CHECK: error: invalid numeric label in uselistorder_bb
 @ba1 = constant i8* blockaddress (@foo, %1)
 define void @foo() {
   br label %1
   unreachable
 }
 uselistorder_bb @foo, %1, { 1, 0 }