[js] Change mod_n to be more like the jvm and moarvm backends.

Author: pmurias

src/vm/js/QAST/Compiler.nqp

@@ -440,6 +440,9 @@ class QAST::OperationsJS {
     add_infix_op('div_n', $T_NUM, '/', $T_NUM, $T_NUM);
     add_infix_op('mod_n', $T_NUM, '%', $T_NUM, $T_NUM);
 
+    add_simple_op('mod_n', $T_NUM, [$T_NUM, $T_NUM]);
+
+
     add_simple_op('neg_n', $T_NUM, [$T_NUM], sub ($num) {"(-$num)"});
     add_simple_op('neg_i', $T_INT, [$T_INT], sub ($num) {"(-$num)"});
 

src/vm/js/nqp-runtime/core.js

@@ -695,6 +695,10 @@ op.lcm_i = function(a, b) {
   return (a * b) / op.gcd_i(a, b);
 };
 
+op.mod_n = function(a, b) {
+  return a - Math.floor(a / b) * b;
+};
+
 function typeparameters(ctx, type) {
   var st = type._STable;
   if (!st.parametricType) {