System.Runtime.InteropServices.JavaScript.Runtime is not linker-safe

[eerhardt]

We recently introduced a JavaScript.Runtime class with methods like the following:

runtime/src/libraries/System.Runtime.InteropServices.JavaScript/src/System/Runtime/InteropServices/JavaScript/Runtime.cs

Lines 61 to 64 in 9ce5e48

	public static int BindJSObject(int jsId, int mappedType)
	{
	JSObject? obj;
	lock (_boundObjects)

These methods are invoked through JS code here:

runtime/src/mono/wasm/runtime/binding_support.js

Lines 60 to 61 in 2c3cd0d

	var namespace = "System.Runtime.InteropServices.JavaScript";
	var classname = binding_fqn_class.length > 0 ? binding_fqn_class : "Runtime";

runtime/src/mono/wasm/runtime/binding_support.js

Lines 79 to 82 in 2c3cd0d

	this.bind_js_obj = get_method ("BindJSObject");
	this.bind_core_clr_obj = get_method ("BindCoreCLRObject");
	this.bind_existing_obj = get_method ("BindExistingObject");
	this.unbind_js_obj = get_method ("UnBindJSObject");

However, the linker doesn't know that these methods need to be preserved, so it is trimming them out. Thus, a trimmed Blazor app doesn't load successfully.

We should enable it so these methods are preserved by the linker.

cc @marek-safar @lewing

[marek-safar]

I think the master version should have that fixed already