[llvm] Revert "Revert "[AMDGPU][LTO] Assume closed world after linking (#105845)" (#106000)" (PR #106001)

[Anshil Gandhi via llvm-commits]

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+; RUN: opt -O3 -debug-only=amdgpu-attributor -S -o - %s 2>&1 | FileCheck %s --check-prefix=PRE-LINK
+; RUN: opt -passes="lto<O3>" -debug-only=amdgpu-attributor -S -o - %s 2>&1 | FileCheck %s --check-prefix=POST-LINK
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gandhi56 wrote:

Created a PR: #106027

https://github.com/llvm/llvm-project/pull/106001