[NFC][MLIR][TableGen] Drop namespace around static Op constraint functions (llvm#162120)

Op constraints are emitted as static standalone functions and need not
be surrounded by the Dialect's C++ namespace. Currently they are, and
this change stops emitting a namespace around these static functions.

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/Dialect/XeGPU/IR/XeGPUOps.cpp

@@ -20,8 +20,8 @@
 
 #define DEBUG_TYPE "xegpu"
 
-namespace mlir {
-namespace xegpu {
+using namespace mlir;
+using namespace mlir::xegpu;
 
 static bool isSharedMemory(const MemRefType &memrefTy) {
   Attribute attr = memrefTy.getMemorySpace();
@@ -1132,9 +1132,6 @@ LogicalResult StoreMatrixOp::verify() {
                                [&]() { return emitError(); });
 }
 
-} // namespace xegpu
-} // namespace mlir
-
 namespace mlir {
 #include <mlir/Dialect/XeGPU/IR/XeGPUAttrInterface.cpp.inc>
 } // namespace mlir

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

@@ -4896,7 +4896,7 @@ 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,