[clang] [llvm] [ValueTracking] Return true for AddrSpaceCast in canCreateUndefOrPoison (PR #144686)

[Matt Arsenault via llvm-commits]

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@@ -0,0 +1,25 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -S -mtriple=amdgcn-amd-amdhsa -passes=instcombine %s | FileCheck %s
+
+; Check that `select B, true, C` isn't optimized to `or B, C`,
+; because the invalid addrspacecast %asc.shared may introduce poison.
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arsenm wrote:

Description is slightly inaccurate. In this case it will always be poison

https://github.com/llvm/llvm-project/pull/144686