LibJS: Rename Bytecode::Op::PropertyKind => Bytecode::PutKind

This is only used to specify how a property is being added to an object
by Put* instructions, so let's call it PutKind.

Also add an enumeration X macro for it to prepare for upcoming
specializations.

Libraries/LibJS/Bytecode/PutKind.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2025, Andreas Kling <andreas@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+namespace JS::Bytecode {
+
+// PutKind indicates how a property is being set.
+// `Normal` is a normal `o.foo = x` or `o[foo] = x` operation.
+// The others are used for object expressions.
+#define JS_ENUMERATE_PUT_KINDS(X) \
+    X(Normal)                     \
+    X(Getter)                     \
+    X(Setter)                     \
+    X(Prototype)                  \
+    X(Own) // Always sets an own property, never calls a setter.
+
+enum class PutKind {
+#define __JS_ENUMERATE_PUT_KIND(name) name,
+    JS_ENUMERATE_PUT_KINDS(__JS_ENUMERATE_PUT_KIND)
+#undef __JS_ENUMERATE_PUT_KIND
+};
+
+}