[TensorExpr] Fix order comparisons for unsigned types (#44857)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/44857
Test Plan: test_tensorexpr --gtest_filter=TensorExprTest.LLVMCompareSelectByte*_LLVM
Reviewed By: glaringlee
Differential Revision: D23762162
Pulled By: asuhan
fbshipit-source-id: 1553429bd2d5292ccda57910326b8c70e4e6ab88
