[llvm] [mlir] [mlir][core] Add an MLIR "pattern catalog" generator (PR #146228)

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``````````diff
--- lit.cfg.py	2025-06-30 04:48:32.000000 +0000
+++ lit.cfg.py	2025-06-30 04:51:16.136296 +0000
@@ -300,22 +300,20 @@
         [
             ToolSubst("mlir-opt", "mlir-opt --verify-roundtrip", unresolved="fatal"),
         ]
     )
 elif "MLIR_GENERATE_PATTERN_CATALOG" in os.environ:
-    tools.extend([
-        ToolSubst(
-            "mlir-opt",
-            "mlir-opt --debug-only=generate-pattern-catalog --mlir-disable-threading",
-            unresolved="fatal"
-        ),
-        ToolSubst(
-            "FileCheck",
-            "FileCheck --dump-input=always",
-            unresolved="fatal"
-        ),
-    ])
+    tools.extend(
+        [
+            ToolSubst(
+                "mlir-opt",
+                "mlir-opt --debug-only=generate-pattern-catalog --mlir-disable-threading",
+                unresolved="fatal",
+            ),
+            ToolSubst("FileCheck", "FileCheck --dump-input=always", unresolved="fatal"),
+        ]
+    )
 else:
     tools.extend(["mlir-opt"])
 
 llvm_config.add_tool_substitutions(tools, tool_dirs)
 

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https://github.com/llvm/llvm-project/pull/146228