[InstCombine] Combine x < ~x into x < 0 #57532
Description
This is listed in Synthesizing an instruction selection rule library from semantic specifications as an example of patterns that were synthesized by an SMT solver but were missing from both GCC and LLVM.
32-bit example (godbolt, alive):
bool src(int32_t x) { return x < ~x; }
bool tgt(int32_t x) { return x < 0; }