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Commit 45230239 authored by Jakob Stoklund Olesen's avatar Jakob Stoklund Olesen
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Replace a big gob of old coalescer logic with the new CoalescerPair class. 

CoalescerPair can determine if a copy can be coalesced, and which register gets
merged away. The old logic in SimpleRegisterCoalescing had evolved into
something a bit too convoluted.

This second attempt fixes some crashes that only occurred Linux.

llvm-svn: 106769
parent 4143e9de
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