[llvm-dev] Do we need a stats-file option for lld?

[zxl via llvm-dev]

Hello, all:   I want to analyze the source of performance improvement by analyzing optimization statistics. So I add a "--stats-file=" option in lld which can print statistics data into a file. The effect of this option is very similar to the following patch below: https://reviews.llvm.org/D45531.
   Do we need an optimization statistics option for lld? If we need it, in whch folder should the test be added?
    Thank you very much.
                                                                                                                                  ZhengxianLi
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