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This fixes a bug (found by csmith) at -O0 where we attempt to create a RLWIMI with an out-of-range operand. Most uses of the isRunOfOnes function are guarded by a condition that the value is not zero. This was not true in two places, and in both places a zero input would result in an out-of-rage MB value (= 32). To fix this, isRunOfOnes returns false on a zero input (and I've remove one now-redundant guard). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186101 91177308-0d34-0410-b5e6-96231b3b80d8
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