Chandler Carruth 04cc665cef [Unroll] Switch from an eagerly populated SCEV cache to one that is ...

lazily built.

Also, make it a much more generic SCEV cache, which today exposes only
a reduced GEP model description but could be extended in the future to
do other profitable caching of SCEV information.

llvm-svn: 238124

2015-05-25 01:00:46 +00:00

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