[llvm] [TableGen] Fix a potential crash when operand doesn't appear in the instruction pattern (PR #87663)

[Ivan Kosarev via llvm-commits]

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@@ -3872,6 +3872,7 @@ void CodeGenDAGPatterns::parseInstructionPattern(CodeGenInstruction &CGI,
       }
       I.error("Operand $" + OpName +
               " does not appear in the instruction pattern");
+      continue;
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kosarev wrote:

Should we also `continue` on the empty-name error above?

https://github.com/llvm/llvm-project/pull/87663