Update generate_mips.py

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Status (for commit 556985e1813a82da9518099ec5e127d8d8a73ea1): Regression cleared

Current dhrystone MIPS (in commit 556985e1813a82da9518099ec5e127d8d8a73ea1): 73.52967619659657 Previous best (recorded in commit a0fc7eac0766f70973b648f91669e1276eb6c956): 84.84963545082081, difference -13.34%

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