[InstCombine] Optimise shift+and+boolean conversion pattern to simple comparison

if (`C1` is pow2) & (`(C2 & ~(C1-1)) + C1)` is pow2):
    ((C1 << X) & C2) == 0 -> X >= (Log2(C2+C1) - Log2(C1));
https://alive2.llvm.org/ce/z/EJAl1R
    ((C1 << X) & C2) != 0 -> X  < (Log2(C2+C1) - Log2(C1));
https://alive2.llvm.org/ce/z/3bVRVz

And remove dead code.

Fix: https://github.com/llvm/llvm-project/issues/56124

Reviewed By: spatel

Differential Revision: https://reviews.llvm.org/D126591