Add .type property to WASM Memory, Table & Global

This is part of adding type reflections to the WebAssembly JS-API. This
adds a new property on the WebAssembly.Memory, WebAssembly.Table &
WebAssembly.Global objects. It exposes the current type or the object in
a format which is compatible with the constructor for type's
constructor.

Differential Revision: https://phabricator.services.mozilla.com/D90702

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1651725
gecko-commit: dff33d0b33c8fb168966504f5562572ddec72a8e
gecko-reviewers: lth

wasm/jsapi/table/type.tentative.any.js

@@ -0,0 +1,26 @@
+// META: global=window,dedicatedworker,jsshell
+// META: script=/wasm/jsapi/assertions.js
+
+function assert_type(argument) {
+    const mytable = new WebAssembly.Table(argument);
+
+    assert_equals(mytable.type.minimum, argument.minimum);
+    assert_equals(mytable.type.maximum, argument.maximum);
+    assert_equals(mytable.type.element, argument.element);
+}
+
+test(() => {
+    assert_type({ "minimum": 0, "element": "funcref"});
+}, "Zero initial, no maximum");
+
+test(() => {
+    assert_type({ "minimum": 5, "element": "funcref" });
+}, "Non-zero initial, no maximum");
+
+test(() => {
+    assert_type({ "minimum": 0, "maximum": 0, "element": "funcref" });
+}, "Zero maximum");
+
+test(() => {
+    assert_type({ "minimum": 0, "maximum": 5, "element": "funcref" });
+}, "None-zero maximum");