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Author SHA1 Message Date
Jakob Stoklund Olesen
e3c4840e77 Avoid folding loads that are unsafe to move. 
LiveRangeEdit::foldAsLoad() can eliminate a register by folding a load
into its only use. Only do that when the load is safe to move, and it
won't extend any live ranges.

This fixes PR13414.

llvm-svn: 160575
 2012-07-20 21:29:31 +00:00