[clang] [llvm] [SystemZ][z/OS] Update autoconversion functions to improve support for UTF-8 (PR #98652)

[Zibi Sarbinowski via llvm-commits]

================
@@ -70,6 +70,11 @@ class FileEntryRef {
   const FileEntry &getFileEntry() const {
     return *getBaseMapEntry().second->V.get<FileEntry *>();
   }
+
+  // This is a non const version of getFileEntry() which is used if the buffer
+  // size needs to be increased due to potential z/OS EBCDIC -> UTF-8 conversion
----------------
zibi2 wrote:

```suggestion
  // This function is used if the buffer size needs to be increased 
  // due to potential z/OS EBCDIC -> UTF-8 conversion
```

https://github.com/llvm/llvm-project/pull/98652