[llvm] [AMDGPU] Add amdgpu-lower-exec-sync pass to lower named-barrier globals (PR #165692)

[via llvm-commits]

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+; RUN: opt -S -mtriple=amdgcn-- -amdgpu-lower-exec-sync < %s 2>&1 | FileCheck %s
+
+%class.ExpAmdWorkgroupWaveBarrier = type { target("amdgcn.named.barrier", 0) }
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skc7 wrote:

Updated this test with auto-generates checks. 
new-pm RUN line has been added in new patch in #166731

https://github.com/llvm/llvm-project/pull/165692