[llvm] [UTC] Don't rename %. inside quoted strings in test checkseg (PR #218767)

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``````````diff
--- common.py	2026-08-26 18:53:05.000000 +0000
+++ common.py	2026-08-26 18:55:35.027661 +0000
@@ -1201,11 +1201,11 @@
 
     # Create a FileCheck variable name based on an IR name.
     def get_value_name(self, var: str, check_prefix: str):
         var = var.replace("!", "")
         var = var.replace("%", "")
-        if (var.startswith(".")):
+        if var.startswith("."):
             var = var.replace(".", "dot", 1)
         if self.replace_number_with_counter:
             assert var
             replacement = self.variable_mapping.get(var, None)
             if replacement is None:

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https://github.com/llvm/llvm-project/pull/218767