[llvm] [utils][UpdateTestChecks] Warn about possible target triple mismatch (PR #149645)

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``````````bash
darker --check --diff -r HEAD~1...HEAD llvm/utils/UpdateTestChecks/common.py llvm/utils/update_llc_test_checks.py
``````````

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View the diff from darker here.
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``````````diff
--- UpdateTestChecks/common.py	2025-07-19 08:36:26.000000 +0000
+++ UpdateTestChecks/common.py	2025-07-19 08:38:51.886676 +0000
@@ -879,11 +879,11 @@
 
     def process_run_line(self, function_re, scrubber, raw_tool_output, prefixes):
         build_global_values_dictionary(
             self._global_var_dict, raw_tool_output, prefixes, self._ginfo
         )
-        
+
         processed_func_count = 0
         for m in function_re.finditer(raw_tool_output):
             if not m:
                 continue
             processed_func_count += 1
@@ -1001,11 +1001,11 @@
                         # An earlier RUN line used this check prefixes but didn't produce
                         # a body for this function. This happens in Clang tests that use
                         # preprocesser directives to exclude individual functions from some
                         # RUN lines.
                         self._func_dict[prefix][func] = None
-        return processed_func_count        
+        return processed_func_count
 
     def processed_prefixes(self, prefixes):
         """
         Mark a set of prefixes as having had at least one applicable RUN line fully
         processed. This is used to filter out function bodies that don't have
--- update_llc_test_checks.py	2025-07-19 08:36:26.000000 +0000
+++ update_llc_test_checks.py	2025-07-19 08:38:52.014386 +0000
@@ -140,12 +140,16 @@
         triple = triple_in_cmd or triple_in_ir
         if not triple:
             triple = common.get_triple_from_march(march_in_cmd)
 
         scrubber, function_re = output_type.get_run_handler(triple)
-        if not builder.process_run_line(function_re, scrubber, raw_tool_output, prefixes):
-            common.warn("Couldn't match any function. Possibly the wrong target triple has been provided")
+        if not builder.process_run_line(
+            function_re, scrubber, raw_tool_output, prefixes
+        ):
+            common.warn(
+                "Couldn't match any function. Possibly the wrong target triple has been provided"
+            )
         builder.processed_prefixes(prefixes)
 
     func_dict = builder.finish_and_get_func_dict()
     global_vars_seen_dict = {}
 

``````````

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https://github.com/llvm/llvm-project/pull/149645