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Commit e4c46ddd authored by Petar Avramovic's avatar Petar Avramovic
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[GlobalISel] Improve elimination of dead instructions in legalizer

Add eraseInstr(s) utility functions. Before deleting an instruction
collects its use instructions. After deletion deletes use instructions
that became trivially dead.
This patch clears all dead instructions in existing legalizer mir tests.

Differential Revision: https://reviews.llvm.org/D109154
parent c8cb7f61
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