[llvm] [TableGen][DecoderEmitter] Report all decoding conflicts (PR #157847)

[Sergei Barannikov via llvm-commits]

================
@@ -559,6 +562,9 @@ class FilterChooser {
     return Encodings[EncodingIDs.back()].getBitWidth();
   }
 
+  /// Returns true if any decoding conflicts were encountered.
+  bool getHasConflict() const { return HasConflict; }
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s-barannikov wrote:

```suggestion
  bool hasConflict() const { return HasConflict; }
```

https://github.com/llvm/llvm-project/pull/157847