[clang-tools-extra] [clang-tidy][NFC] Apply const-correctness for auto 1/N (PR #213839)

[Baranov Victor via cfe-commits]

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@@ -187,7 +188,7 @@ class ErrorReporter {
       }
       reportFix(Diag, Error.Message.Fix);
     }
-    for (auto Fix : FixLocations) {
+    for (const auto Fix : FixLocations) {
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vbvictor wrote:

Hm, it seem that upstream llvm isn't typically built with this diagnostic enabled. Feel free to post PR with const auto&, or I will do it some time today. 

https://github.com/llvm/llvm-project/pull/213839