[llvm] [Utils][update_mc_test_checks] Generate check lines in alphabetical order. (PR #164424)

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``````````bash
darker --check --diff -r origin/main...HEAD llvm/utils/update_mc_test_checks.py
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``````````diff
--- update_mc_test_checks.py	2025-10-21 13:00:51.000000 +0000
+++ update_mc_test_checks.py	2025-10-21 13:48:45.112596 +0000
@@ -319,11 +319,11 @@
                 check = getErrCheckLine(prefix, o, mc_mode, line_offset)
             else:
                 check = getStdCheckLine(prefix, o, mc_mode)
 
             if check:
-              check_lines.append(check.strip())
+                check_lines.append(check.strip())
 
         generated_prefixes[input_line] = "\n".join(check_lines)
 
     # write output
     for input_info in ti.iterlines(output_lines):

``````````

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https://github.com/llvm/llvm-project/pull/164424