[InstCombine] new testcases for OverflowingBinaryOperators and PossiblyExactOperators transformations; NFC
instcombine should transform the relevant cases if the OverflowingBinaryOperator/PossiblyExactOperator can be proven to be safe. Change-Id: I7aec62a31a894e465e00eb06aed80c3ea0c9dd45 llvm-svn: 331265
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