Revert "[LV] Mark checks as never succeeding for high cost cutoff."
This reverts commit 8a115b6934a90441d77ea54af73e7aaaa1394b38.
This broke premerge. https://lab.llvm.org/staging/#/builders/192/builds/13326
/home/gha/llvm-project/clang/test/Frontend/optimization-remark-options.c:10:11: remark: loop not vectorized: cannot prove it is safe to reorder floating-point operations; allow reordering by specifying '#pragma clang loop vectorize(enable)' before the loop or by providing the compiler option '-ffast-math'