Use m_APInt in SimplifyCFG
Use m_APInt in SimplifyCFG

Switch from m_Constant to m_APInt per David's request. NFC.

Author: Thomas Jablin (tjablin)
Reviewers: majnemer cycheng

http://reviews.llvm.org/D21440

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@272977 91177308-0d34-0410-b5e6-96231b3b80d8

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