[llvm-dev] Conflicting check prefix detection not working in update_llc_test_checks.py?

[Craig Topper via llvm-dev]

update_llc_test_checks.py seems to not be telling me about assembly that
differs under the same prefix anymore.

An easy way to see this is to just remove the --check-prefix from
test/CodeGen/RISCV/alu32.ll and run the script. You'll get no error about
conflicts. And if you look at the resulting file only some functions will
have been updated to use CHECK as the prefix.

Reverting some commits to update_llc_test_checks.py suggest this may have
been broken by e2dc306b1ac71258e6ce40a66e778527f282c355 [utils] Fix
UpdateTestChecks case where 2 runs differ for last label

~Craig
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