[llvm] Use DIExpression::foldConstantMath at the result of a Salvaged expression (PR #71721)

[Stephen Tozer via llvm-commits]

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@@ -22,6 +22,7 @@
 #include "llvm/IR/Type.h"
 #include "llvm/IR/Value.h"
 
+#include <bit>
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SLTozer wrote:

Unneeded include?

https://github.com/llvm/llvm-project/pull/71721