Chris Lattner cbd19c14f1 Fix a case where LegalizeAllNodesNotLeadingTo could take exponential time.
This manifested itself as really long time to compile
Regression/CodeGen/Generic/2003-05-28-ManyArgs.ll on ppc.
This is PR847.

llvm-svn: 29313
2006-07-26 23:55:56 +00:00
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