Bug 1332691: Make a testharness.js polyfill for Spidermonkey; r=luke

MozReview-Commit-ID: IWhymoUJgJ7

--HG--
extra : rebase_source : d1faa7408ed1d7b795e0d52df02401d29bcdc9f2

js/src/jit-test/lib/wasm-testharness.js

+if (!wasmIsSupported())
+    quit();
+
+load(scriptdir + 'harness/index.js');
+load(scriptdir + 'harness/wasm-constants.js');
+load(scriptdir + 'harness/wasm-module-builder.js');
+
+function test(func, description) {
+    let maybeErr;
+    try {
+        func();
+    } catch(e) {
+        maybeErr = e;
+    }
+
+    if (typeof maybeErr !== 'undefined') {
+        throw new Error(`${description}: FAIL.
+${maybeErr}
+${maybeErr.stack}`);
+    } else {
+        print(`${description}: PASS.`);
+    }
+}
+
+function promise_test(func, description) {
+    func()
+    .then(_ => {
+        print(`${description}: PASS.`);
+    })
+    .catch(err => {
+        print(`${description}: FAIL.
+${err}`);
+    });
+    drainJobQueue();
+}
+
+let assert_equals = assertEq;
+let assert_true = (x, errMsg) => { assertEq(x, true); }
+let assert_false = (x, errMsg) => { assertEq(x, false); }
+
+function assert_unreached(description) {
+    throw new Error(`unreachable:\n${description}`);
+}
+
+setJitCompilerOption('wasm.test-mode', 1);