Frame lowering optimizations#1

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nikolaperic wants to merge 4 commits intoMediaTek-Labs:nanomips-llvm13-submissionfrom

nikolaperic:save-restore-opt

Commits on Apr 12, 2023

Enable save/restore generation when there is a gap between registers

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NanoMips: Two-step stack setup

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NanoMips: Frame pointer setup

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Commits on Jul 26, 2023

Merged same if instructions

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