[llvm] [Bitcode] Fix constexpr expansion creating invalid PHIs (PR #141560)

[Nikita Popov via llvm-commits]

================
@@ -1,4 +1,5 @@
 ; RUN: llvm-dis -expand-constant-exprs < %s.bc | FileCheck %s
+; RUN: opt -expand-constant-exprs -p verify %s.bc
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nikic wrote:

```suggestion
; RUN: opt -S -expand-constant-exprs %s.bc
```

https://github.com/llvm/llvm-project/pull/141560