AMDGPU: Switch barrier intrinsics to using convergent

noduplicate prevents unrolling of small loops that happen to have
barriers in them. If a loop has a barrier in it, it is OK to duplicate
it for the unroll.

llvm-svn: 256075
diff --git a/llvm/test/CodeGen/AMDGPU/schedule-vs-if-nested-loop-failure.ll b/llvm/test/CodeGen/AMDGPU/schedule-vs-if-nested-loop-failure.ll
index 3863afd..e4b16c0 100644
--- a/llvm/test/CodeGen/AMDGPU/schedule-vs-if-nested-loop-failure.ll
+++ b/llvm/test/CodeGen/AMDGPU/schedule-vs-if-nested-loop-failure.ll
@@ -3,7 +3,7 @@
 ; RUN: llc -O0 -march=amdgcn -mcpu=SI -verify-machineinstrs< %s | FileCheck %s -check-prefix=SI
 ; RUN: llc -O0 -march=amdgcn -mcpu=tonga -verify-machineinstrs< %s | FileCheck %s -check-prefix=SI
 
-declare void @llvm.AMDGPU.barrier.local() nounwind noduplicate
+declare void @llvm.AMDGPU.barrier.local() nounwind convergent
 
 
 ; SI-LABEL: {{^}}main(