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532d0ce208
Implement the first step towards arbitrary precision integer support in LLVM. The APInt class provides arbitrary precision arithmetic and value representation. This patch changes ConstantInt to use APInt as its value representation without supporting bit widths > 64 yet. That change will come after ConstantFolding handles bit widths > 64 bits. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34647 91177308-0d34-0410-b5e6-96231b3b80d8
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