Remove MLIR C-API explicit registration of standard ops.

[stellaraccident]

Summary

• Added mlirRegisterAllDialects() to the python API until a more complete registration design emerges for it.

mlir/lib/Bindings/Python/IRModules.cpp

 //===- IRModules.cpp - IR Submodules of pybind module ---------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include "IRModules.h"
 #include "PybindUtils.h"
 
+#include "mlir-c/Registration.h"
 #include "mlir-c/StandardAttributes.h"
 #include "mlir-c/StandardTypes.h"
 #include "llvm/ADT/SmallVector.h"
 #include <pybind11/stl.h>
 
 namespace py = pybind11;
 using namespace mlir;
 using namespace mlir::python;
PyMlirContext::~PyMlirContext() {
   // liveContexts.
   py::gil_scoped_acquire acquire;
   getLiveContexts().erase(context.ptr);
   mlirContextDestroy(context);
 }
 
 PyMlirContext *PyMlirContext::createNewContextForInit() {
   MlirContext context = mlirContextCreate();
+  mlirRegisterAllDialects(context);
   return new PyMlirContext(context);
 }
 
 PyMlirContextRef PyMlirContext::forContext(MlirContext context) {
   py::gil_scoped_acquire acquire;
   auto &liveContexts = getLiveContexts();
   auto it = liveContexts.find(context.ptr);
   if (it == liveContexts.end()) {

mlir/lib/CAPI/IR/IR.cpp

 //===- IR.cpp - C Interface for Core MLIR APIs ----------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include "mlir-c/IR.h"
 
 #include "mlir/CAPI/IR.h"
 #include "mlir/CAPI/Utils.h"
-#include "mlir/Dialect/StandardOps/IR/Ops.h"
 #include "mlir/IR/Attributes.h"
 #include "mlir/IR/Dialect.h"
 #include "mlir/IR/Module.h"
 #include "mlir/IR/Operation.h"
 #include "mlir/IR/Types.h"
 #include "mlir/Parser.h"
 
 using namespace mlir;
 
 /* ========================================================================== */
 /* Context API.                                                               */
 /* ========================================================================== */
 
 MlirContext mlirContextCreate() {
   auto *context = new MLIRContext(/*loadAllDialects=*/false);
-  // TODO: Come up with a story for which dialects to load into the context
-  // and do not expand this beyond StandardOps until done so. This is loaded
-  // by default here because it is hard to make progress otherwise.
-  context->loadDialect<StandardOpsDialect>();
   return wrap(context);
 }
 
 int mlirContextEqual(MlirContext ctx1, MlirContext ctx2) {
   return unwrap(ctx1) == unwrap(ctx2);
 }
 
 void mlirContextDestroy(MlirContext context) { delete unwrap(context); }