[PowerPC] Fix signed overflow in decomposeMulByConstant after D88201
Caught by multipliers LONG_MAX (after +1) and LONG_MIN (after -1) in CodeGen/PowerPC/mul-const-i64.ll
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0232f2d3
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Caught by multipliers LONG_MAX (after +1) and LONG_MIN (after -1) in CodeGen/PowerPC/mul-const-i64.ll