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Commit 7a9f0c09 authored by Jakob Stoklund Olesen's avatar Jakob Stoklund Olesen
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Switch MRI::UsedPhysRegs to a register unit bit vector. 

This is a more compact, less redundant representation, and it avoids
scanning long lists of aliases for ARM D-registers, for example.

llvm-svn: 166124
parent 89a452a9
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