[llvm] [DecoderEmitter] Support for DecodeOrder and `resolve-conflicts-try-all` (PR #157948)

[Sergei Barannikov via llvm-commits]

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@@ -1598,6 +1726,19 @@ void FilterChooser::doFilter() {
     return;
   }
 
+  // If we were unable to find a useful filter and there are multiple decode
+  // orders involved, split the candidates by decode order and create per decode
+  // order choosers.
+  if (hasMultipleDecodeOrders()) {
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s-barannikov wrote:

I think you're looking at the issue from the wrong side. The problem is not that we bail after `Decode` fails. `Decode` means we know that *there are no other encodings that could match*, but we emit it even if there *are* other encodings that could match. This is a bug mandated by VariableFC.


https://github.com/llvm/llvm-project/pull/157948