Revert "[mlir] Remove methods from mlir::OpState that just forward to mlir::Operation."

This reverts commit 6f271e9.

Differential Revision: https://reviews.llvm.org/D93242

Author: chsigg

mlir/include/mlir/IR/OpDefinition.h

@@ -108,6 +108,28 @@ class OpState {
   /// Return the operation that this refers to.
   Operation *getOperation() { return state; }
 
+  /// Return the dialect that this refers to.
+  Dialect *getDialect() { return getOperation()->getDialect(); }
+
+  /// Return the parent Region of this operation.
+  Region *getParentRegion() { return getOperation()->getParentRegion(); }
+
+  /// Returns the closest surrounding operation that contains this operation
+  /// or nullptr if this is a top-level operation.
+  Operation *getParentOp() { return getOperation()->getParentOp(); }
+
+  /// Return the closest surrounding parent operation that is of type 'OpTy'.
+  template <typename OpTy>
+  OpTy getParentOfType() {
+    return getOperation()->getParentOfType<OpTy>();
+  }
+
+  /// Returns the closest surrounding parent operation with trait `Trait`.
+  template <template <typename T> class Trait>
+  Operation *getParentWithTrait() {
+    return getOperation()->getParentWithTrait<Trait>();
+  }
+
   /// Return the context this operation belongs to.
   MLIRContext *getContext() { return getOperation()->getContext(); }
 
@@ -134,6 +156,37 @@ class OpState {
   using dialect_attr_iterator = Operation::dialect_attr_iterator;
   using dialect_attr_range = Operation::dialect_attr_range;
 
+  /// Return a range corresponding to the dialect attributes for this operation.
+  dialect_attr_range getDialectAttrs() { return state->getDialectAttrs(); }
+  dialect_attr_iterator dialect_attr_begin() {
+    return state->dialect_attr_begin();
+  }
+  dialect_attr_iterator dialect_attr_end() { return state->dialect_attr_end(); }
+
+  /// Return an attribute with the specified name.
+  Attribute getAttr(StringRef name) { return state->getAttr(name); }
+
+  /// If the operation has an attribute of the specified type, return it.
+  template <typename AttrClass>
+  AttrClass getAttrOfType(StringRef name) {
+    return getAttr(name).dyn_cast_or_null<AttrClass>();
+  }
+
+  /// If the an attribute exists with the specified name, change it to the new
+  /// value.  Otherwise, add a new attribute with the specified name/value.
+  void setAttr(Identifier name, Attribute value) {
+    state->setAttr(name, value);
+  }
+  void setAttr(StringRef name, Attribute value) {
+    setAttr(Identifier::get(name, getContext()), value);
+  }
+
+  /// Set the attributes held by this operation.
+  void setAttrs(ArrayRef<NamedAttribute> attributes) {
+    state->setAttrs(attributes);
+  }
+  void setAttrs(MutableDictionaryAttr newAttrs) { state->setAttrs(newAttrs); }
+
   /// Set the dialect attributes for this operation, and preserve all dependent.
   template <typename DialectAttrs> void setDialectAttrs(DialectAttrs &&attrs) {
     state->setDialectAttrs(std::move(attrs));