[compiler-rt] [Sanitizer] Use % patterns in report paths (PR #141820)

[Ellis Hoag via llvm-commits]

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@@ -96,12 +96,75 @@ static void RecursiveCreateParentDirs(char *path) {
   }
 }
 
+/// Parse the report path \p pattern and copy the parsed path to \p dest.
+///
+/// * `%%` becomes `%`
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ellishg wrote:

Just for completeness. Is there any reason we shouldn't handle this case?

https://github.com/llvm/llvm-project/pull/141820