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83a8031336
No functionality change. The hook makes it explicit which patterns require "special" handling. i.e. it self-documents tblgen deficiencies. I plan to add verification in ExpandISelPseudos and Thumb2SizeReduce to catch any missing hasPostISelHooks. Otherwise it's too fragile. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140160 91177308-0d34-0410-b5e6-96231b3b80d8
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