LibJS: Implement bitwise unsigned right shift operator (>>>)

Author: https://github.com/linusg
Commit: 396ecfa2d7
Pull-request: https://github.com/SerenityOS/serenity/pull/1931
Reviewed-by: https://github.com/awesomekling

Libraries/LibJS/Tests/binary-bitwise-unsigned-right-shift.js

@@ -0,0 +1,63 @@
+load("test-common.js");
+
+try {
+    assert((0 >>> 0) === 0);
+    assert((0 >>> 1) === 0);
+    assert((0 >>> 2) === 0);
+    assert((0 >>> 3) === 0);
+    assert((0 >>> 4) === 0);
+    assert((0 >>> 5) === 0);
+
+    assert((1 >>> 0) === 1);
+    assert((1 >>> 1) === 0);
+    assert((1 >>> 2) === 0);
+    assert((1 >>> 3) === 0);
+    assert((1 >>> 4) === 0);
+    assert((1 >>> 5) === 0);
+
+    assert((5 >>> 0) === 5);
+    assert((5 >>> 1) === 2);
+    assert((5 >>> 2) === 1);
+    assert((5 >>> 3) === 0);
+    assert((5 >>> 4) === 0);
+    assert((5 >>> 5) === 0);
+
+    assert((42 >>> 0) === 42);
+    assert((42 >>> 1) === 21);
+    assert((42 >>> 2) === 10);
+    assert((42 >>> 3) === 5);
+    assert((42 >>> 4) === 2);
+    assert((42 >>> 5) === 1);
+
+    assert((-1 >>> 0) === 4294967295);
+    assert((-1 >>> 1) === 2147483647);
+    assert((-1 >>> 2) === 1073741823);
+    assert((-1 >>> 3) === 536870911);
+    assert((-1 >>> 4) === 268435455);
+    assert((-1 >>> 5) === 134217727);
+
+    assert((-5 >>> 0) === 4294967291);
+    assert((-5 >>> 1) === 2147483645);
+    assert((-5 >>> 2) === 1073741822);
+    assert((-5 >>> 3) === 536870911);
+    assert((-5 >>> 4) === 268435455);
+    assert((-5 >>> 5) === 134217727);
+
+    var x = -67;
+    var y = 4;
+    assert(("-42" >>> 3) === 536870906);
+    assert((x >>> y) === 268435451);
+    assert((x >>> [[[[5]]]]) === 134217725);
+    assert((undefined >>> y) === 0);
+    assert(("a" >>> "b") === 0);
+    assert((null >>> null) === 0);
+    assert((undefined >>> undefined) === 0);
+    assert((NaN >>> NaN) === 0);
+    assert((6 >>> NaN) === 6);
+    assert((Infinity >>> Infinity) === 0);
+    assert((-Infinity >>> Infinity) === 0);
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}