[MLIR][SPIRV] Fixed dialect loading in deserialization

Fixed an error when deserializing the SPIR-V binary
to MLIR SPIR-V. Before, the SPIR-V dialect was not loaded
explicitly into the context, which resulted in unregistered
operation error.

Reviewed By: antiagainst

Differential Revision: https://reviews.llvm.org/D88223

mlir/lib/Dialect/SPIRV/Serialization/TranslateRegistration.cpp

@@ -38,7 +38,7 @@ using namespace mlir;
 // `inputFilename` and returns a module containing the SPIR-V module.
 static OwningModuleRef deserializeModule(const llvm::MemoryBuffer *input,
                                          MLIRContext *context) {
-  Builder builder(context);
+  context->loadDialect<spirv::SPIRVDialect>();
 
   // Make sure the input stream can be treated as a stream of SPIR-V words
   auto start = input->getBufferStart();