[llvm] [RemoveDIs] Load into new debug info format by default in LLVM (PR #89799)

[Orlando Cazalet-Hyams via llvm-commits]

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@@ -22,6 +23,27 @@
 using namespace llvm;
 using namespace IRSimilarity;
 
+extern llvm::cl::opt<bool> UseNewDbgInfoFormat;
+extern cl::opt<cl::boolOrDefault> PreserveInputDbgFormat;
+extern bool WriteNewDbgInfoFormatToBitcode;
+extern cl::opt<bool> WriteNewDbgInfoFormat;
+
+// Backup all of the existing settings that may be modified when
+// PreserveInputDbgFormat=true, so that when the test is finished we return them
+// (and the "preserve" setting) to their original values.
+auto TempSettingChange() {
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OCHyams wrote:

nit: `static`?
double bit: Can we give this a more specific name, e.g. "SaveDbgInfoFormat" or something similar?

https://github.com/llvm/llvm-project/pull/89799