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When lowering a ISD::BRCOND into a test+branch, make sure that we always use the correct condition code to emit the test operation. This fixes PR19858: "i8 checked mul is wrong on x86". Patch by Keno Fisher! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210032 91177308-0d34-0410-b5e6-96231b3b80d8
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