[llvm] [TableGen] Avoid crashing on a missing instruction pattern result (PR #228075)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp b/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
index fb98517d4..864269839 100644
--- a/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
+++ b/llvm/utils/TableGen/Common/CodeGenDAGPatterns.cpp
@@ -4004,9 +4004,9 @@ void CodeGenDAGPatterns::parseInstructionPattern(const CodeGenInstruction &CGI,
     auto InstResultIter = InstResults.find(OpName);
     if (InstResultIter == InstResults.end() || !InstResultIter->second) {
       I.dump();
-      PrintFatalError(CGI.TheDef,
-                      "In " + CGI.TheDef->getName() + ": Operand $" + OpName +
-                          " does not exist in operand list!");
+      PrintFatalError(CGI.TheDef, "In " + CGI.TheDef->getName() +
+                                      ": Operand $" + OpName +
+                                      " does not exist in operand list!");
     }
 
     TreePatternNodePtr RNode = InstResultIter->second;

``````````

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https://github.com/llvm/llvm-project/pull/228075