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Commit 54a9e7a4 authored by Francis Visoiu Mistrih's avatar Francis Visoiu Mistrih
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[CodeGen] Skip some instructions that shouldn't affect shrink-wrapping 

r320606 checked for MI.isMetaInstruction which skips all DBG_VALUEs.

This also skips IMPLICIT_DEFs and other instructions that may def / read
a register.

Differential Revision: https://reviews.llvm.org/D42119

llvm-svn: 322584
parent d3ec3e56
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