[llvm] llvm-ar: fix inconsistent case sensitivity for path matching on Windows (PR #196541)

[via llvm-commits]

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@@ -27,3 +27,34 @@
 # RUN: FileCheck %s -input-file=%t/thin-archive.a --check-prefix=EMPTY --implicit-check-not {{.}}
 
 EMPTY: !<thin>
+
+# File instance counting should respect Windows case-insensitive name matching.
+# Otherwise, if you have foo.txt and FOO.TXT, "-N 2 foo.txt" fails with because
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0xFE4415 wrote:

```suggestion
# Otherwise, if you have foo.txt and FOO.TXT, "-N 2 foo.txt" fails because
```

https://github.com/llvm/llvm-project/pull/196541