[InstCombine] Add mul(x,x) tests showing miscompile
As raised by @efriedma on D117995 - the source must not be undef to demand any bits in mul(x,x) other than bit[1] https://alive2.llvm.org/ce/z/Cxkjen
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As raised by @efriedma on D117995 - the source must not be undef to demand any bits in mul(x,x) other than bit[1] https://alive2.llvm.org/ce/z/Cxkjen