Chris Lattner 389f4efae7 only try to fold constantexpr operands when the worklist is first populated,
don't bother every time going around the main worklist.  This speeds up a 
release-asserts opt -std-compile-opts on 403.gcc by about 4% (1.5s).  It
seems to speed up the most expensive instances of instcombine by ~10%.

llvm-svn: 84171
2009-10-15 04:59:28 +00:00
..
2009-09-12 22:24:25 +00:00