[NFC][MLIR][TableGen] Drop namespace around op constraints functions

Op constraints are emitted as uniqued static standalone funtions
and need not be surrounded by the Op's C++ namespace.

Author: jurahul

mlir/include/mlir/TableGen/CodeGenHelpers.h

@@ -88,7 +88,7 @@ class StaticVerifierFunctionEmitter {
   ///
   /// Constraints that do not meet the restriction that they can only reference
   /// `$_self` and `$_op` are not uniqued.
-  void emitOpConstraints(ArrayRef<const llvm::Record *> opDefs);
+  void emitOpConstraints();
 
   /// Unique all compatible type and attribute constraints from a pattern file
   /// and emit them at the top of the generated file.

mlir/lib/TableGen/CodeGenHelpers.cpp

@@ -49,9 +49,7 @@ StaticVerifierFunctionEmitter::StaticVerifierFunctionEmitter(
     raw_ostream &os, const RecordKeeper &records, StringRef tag)
     : os(os), uniqueOutputLabel(getUniqueOutputLabel(records, tag)) {}
 
-void StaticVerifierFunctionEmitter::emitOpConstraints(
-    ArrayRef<const Record *> opDefs) {
-  NamespaceEmitter namespaceEmitter(os, Operator(*opDefs[0]).getCppNamespace());
+void StaticVerifierFunctionEmitter::emitOpConstraints() {
   emitTypeConstraints();
   emitAttrConstraints();
   emitPropConstraints();

mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp

@@ -4871,7 +4871,7 @@ static void emitOpClassDefs(const RecordKeeper &records,
                                                       constraintPrefix);
   os << formatv(opCommentHeader, "Local Utility Method", "Definitions");
   staticVerifierEmitter.collectOpConstraints(defs);
-  staticVerifierEmitter.emitOpConstraints(defs);
+  staticVerifierEmitter.emitOpConstraints();
 
   // Emit the classes.
   emitOpClasses(records, defs, os, staticVerifierEmitter,