Revert "Stop masking integer template arguments"

This reverts commit 8128247.

Author: lucic71

cpp2rust/converter/mapper.cpp

@@ -13,6 +13,7 @@
 #include <cstdlib>
 #include <format>
 #include <optional>
+#include <regex>
 #include <unordered_map>
 #include <utility>
 #include <vector>
@@ -622,6 +623,17 @@ std::string normalizeTranslationRule(std::string rule) {
   // Detach pointer from double reference. Useful for matching translation
   // rules.
   ReplaceAll(rule, "*&&", "* &&");
+
+  static const std::array<std::pair<std::regex, std::string>, 1>
+      normalization_rules{{
+          // Ignore constant template parameters, i.e. replace them with _.
+          {std::regex(R"(\b\d+\b)"), "_"},
+      }};
+
+  for (const auto &r : normalization_rules) {
+    rule = std::regex_replace(rule, r.first, r.second);
+  }
+
   return rule;
 }