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8128d4b122
As the goal of LLVM reduce is to simplify the input file, it should not modify the debug info format - doing so by default would make it impossible to reduce an error that only occurs in the old format, for example (as briefly discussed at https://github.com/llvm/llvm-project/pull/86275). This patch uses the new "preserve debug info format" flag in llvm-reduce to prevent the input from being subtly transformed by llvm-reduce itself; this has no effect on any tools used for the interestingness check (i.e. if `opt` is invoked, it will still convert the reduced input to the new format by default), but simply ensures that the reduced file is strictly reduced rather than modified.