Add fast paths to ScalarEvolution::getSizeOf and getOffsetOf, as
they're used a lot by getNodeForGEP, which can be called a lot. This speeds up -iv-users by around 15% on several testcases. llvm-svn: 101083
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they're used a lot by getNodeForGEP, which can be called a lot. This speeds up -iv-users by around 15% on several testcases. llvm-svn: 101083