[MLIR] Add move constructor to BytecodeWriterConfig (llvm#126130)

The config is currently not movable and because there are constructors
the default move won't be generated, which prevents it from being moved.
Also, it is not copyable because of the unique_ptr. This PR adds move
constructor to allow moving it.

Author: karimnosseir

mlir/include/mlir/Bytecode/BytecodeWriter.h

@@ -82,6 +82,7 @@ class BytecodeWriterConfig {
   /// printers for the fallback resources within the map.
   BytecodeWriterConfig(FallbackAsmResourceMap &map,
                        StringRef producer = "MLIR" LLVM_VERSION_STRING);
+  BytecodeWriterConfig(BytecodeWriterConfig &&);
   ~BytecodeWriterConfig();
 
   /// An internal implementation class that contains the state of the

mlir/lib/Bytecode/Writer/BytecodeWriter.cpp

@@ -66,6 +66,9 @@ BytecodeWriterConfig::BytecodeWriterConfig(FallbackAsmResourceMap &map,
     : BytecodeWriterConfig(producer) {
   attachFallbackResourcePrinter(map);
 }
+BytecodeWriterConfig::BytecodeWriterConfig(BytecodeWriterConfig &&config)
+    : impl(std::move(config.impl)) {}
+
 BytecodeWriterConfig::~BytecodeWriterConfig() = default;
 
 ArrayRef<std::unique_ptr<AttrTypeBytecodeWriter<Attribute>>>