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681dcd14e9
the bit width of negative numbers by computing the minimum bit width for a negative value. E.g. 0x1800000000000000 could be just 0x8000000000000000 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34695 91177308-0d34-0410-b5e6-96231b3b80d8