xplat: add mixed arg AsmJS test

Test mixed args on XPLAT registers

test/AsmJs/argTestMixed.js

@@ -0,0 +1,78 @@
+//-------------------------------------------------------------------------------------------------------
+// Copyright (C) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
+//-------------------------------------------------------------------------------------------------------
+
+var tests = [
+    function()
+    {
+        function asm() {
+            "use asm"
+            function SubCount(a,b,c,d,e,f,g,h,j,k,l) {
+                a = +a;
+                b = +b;
+                c = c | 0;
+                d = d | 0;
+                e = +e;
+                f = +f;
+                g = +g;
+                h = +h;
+                j = +j;
+                k = +k;
+                l = +l;
+
+                return +(l);
+            }
+
+            function Count(a) {
+                a = +a;
+                return +SubCount(3.2, 1.2, 2, 5, 6.33, 4.88, 1.2, 2.6, 3.99, 1.2, 2.6);
+            }
+
+            return { Count: Count };
+        }
+
+        var total = 0;
+        var fnc = asm ();
+        for(var i = 0;i < 1e6; i++) {
+            total += fnc.Count(1, 2);
+        }
+
+        if (parseInt(total) != parseInt(1e6 * 2.6)) throw new Error('Test Failed -> ' + total);
+    },
+    function() {
+        function asm() {
+            "use asm"
+            function SubCount(a,b,c,d,e,f,g) {
+                a = a | 0;
+                b = b | 0;
+                c = c | 0;
+                d = d | 0;
+                e = e | 0;
+                f = f | 0;
+                g = +g;
+
+                return +(g);
+            }
+
+            function Count(a) {
+                a = +a;
+                return +SubCount(1, 2, 3, 4, 5, 6, 1.3);
+            }
+
+            return { Count: Count };
+        }
+
+        var total = 0;
+        var fnc = asm ();
+        for(var i = 0;i < 1e6; i++) {
+            total += fnc.Count(1, 2);
+        }
+
+        if (parseInt(total) != parseInt(1e6 * 1.3)) throw new Error('Test Failed -> ' + total);
+    }];
+
+for(var i = 0; i < tests.length; i++)
+    tests[i]();
+
+print('PASS')