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The visitSwitchInst generates SUB constant expressions to recompute the switch condition. When truncating the condition to a smaller type, SUB expressions should use the previous type (before trunc) for both operands. Also, fix code to also return the modified switch when only the truncation is performed. This fixes an assertion crash. Differential Revision: http://reviews.llvm.org/D6644 rdar://problem/19191835 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224588 91177308-0d34-0410-b5e6-96231b3b80d8
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