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2. Rewrite operator=(const APInt& RHS) to allow the RHS to be a different bit width than the LHS. This makes it possible to use APInt as the key of a DenseMap, as needed for the IntConstants map in Constants.cpp 3. Fix operator=(uint64_t) to clear unused bits in case the client assigns a value that has more bits than the APInt allows. 4. Assert that bit widths are equal in operator== 5. Revise getHashValue() to put the bit width in the low order six bits. This should help to make i1 0, i2 0, ... i64 0 all distinct in the IntConstants DenseMap. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34646 91177308-0d34-0410-b5e6-96231b3b80d8
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