fix truncate call to use extension method

lib/runtime/dart/math.js

 dart_library.library('dart/math', null, /* Imports */[
   "dart_runtime/dart",
   'dart/core'
 ], /* Lazy imports */[
   'dart/_js_helper'
 ], function(exports, dart, core, _js_helper) {
   'use strict';
   let dartx = dart.dartx;
   class _JenkinsSmiHash extends core.Object {
     static combine(hash, value) {
@@ skipping 376 matching lines @@
   class _Random extends core.Object {
     _Random(seed) {
       this[_lo] = 0;
       this[_hi] = 0;
       let empty_seed = 0;
       if (dart.notNull(seed) < 0) {
         empty_seed = -1;
       }
       do {
         let low = dart.notNull(seed) & dart.notNull(_Random._MASK32);
-        seed = ((dart.notNull(seed) - dart.notNull(low)) / dart.notNull(_POW2_32)).truncate();
+        seed = ((dart.notNull(seed) - dart.notNull(low)) / dart.notNull(_POW2_32))[dartx.truncate]();
         let high = dart.notNull(seed) & dart.notNull(_Random._MASK32);
-        seed = ((dart.notNull(seed) - dart.notNull(high)) / dart.notNull(_POW2_32)).truncate();
+        seed = ((dart.notNull(seed) - dart.notNull(high)) / dart.notNull(_POW2_32))[dartx.truncate]();
         let tmplow = dart.notNull(low) << 21;
         let tmphigh = dart.notNull(high) << 21 | dart.notNull(low) >> 11;
         tmplow = (~dart.notNull(low) & dart.notNull(_Random._MASK32)) + dart.notNull(tmplow);
         low = dart.notNull(tmplow) & dart.notNull(_Random._MASK32);
-        high = ~dart.notNull(high) + dart.notNull(tmphigh) + ((dart.notNull(tmplow) - dart.notNull(low)) / 4294967296).truncate() & dart.notNull(_Random._MASK32);
+        high = ~dart.notNull(high) + dart.notNull(tmphigh) + ((dart.notNull(tmplow) - dart.notNull(low)) / 4294967296)[dartx.truncate]() & dart.notNull(_Random._MASK32);
         tmphigh = dart.notNull(high) >> 24;
         tmplow = dart.notNull(low) >> 24 | dart.notNull(high) << 8;
         low = dart.notNull(low) ^ dart.notNull(tmplow);
         high = dart.notNull(high) ^ dart.notNull(tmphigh);
         tmplow = dart.notNull(low) * 265;
         low = dart.notNull(tmplow) & dart.notNull(_Random._MASK32);
-        high = dart.notNull(high) * 265 + ((dart.notNull(tmplow) - dart.notNull(low)) / 4294967296).truncate() & dart.notNull(_Random._MASK32);
+        high = dart.notNull(high) * 265 + ((dart.notNull(tmplow) - dart.notNull(low)) / 4294967296)[dartx.truncate]() & dart.notNull(_Random._MASK32);
         tmphigh = dart.notNull(high) >> 14;
         tmplow = dart.notNull(low) >> 14 | dart.notNull(high) << 18;
         low = dart.notNull(low) ^ dart.notNull(tmplow);
         high = dart.notNull(high) ^ dart.notNull(tmphigh);
         tmplow = dart.notNull(low) * 21;
         low = dart.notNull(tmplow) & dart.notNull(_Random._MASK32);
-        high = dart.notNull(high) * 21 + ((dart.notNull(tmplow) - dart.notNull(low)) / 4294967296).truncate() & dart.notNull(_Random._MASK32);
+        high = dart.notNull(high) * 21 + ((dart.notNull(tmplow) - dart.notNull(low)) / 4294967296)[dartx.truncate]() & dart.notNull(_Random._MASK32);
         tmphigh = dart.notNull(high) >> 28;
         tmplow = dart.notNull(low) >> 28 | dart.notNull(high) << 4;
         low = dart.notNull(low) ^ dart.notNull(tmplow);
         high = dart.notNull(high) ^ dart.notNull(tmphigh);
         tmplow = dart.notNull(low) << 31;
         tmphigh = dart.notNull(high) << 31 | dart.notNull(low) >> 1;
         tmplow = dart.notNull(tmplow) + dart.notNull(low);
         low = dart.notNull(tmplow) & dart.notNull(_Random._MASK32);
-        high = dart.notNull(high) + dart.notNull(tmphigh) + ((dart.notNull(tmplow) - dart.notNull(low)) / 4294967296).truncate() & dart.notNull(_Random._MASK32);
+        high = dart.notNull(high) + dart.notNull(tmphigh) + ((dart.notNull(tmplow) - dart.notNull(low)) / 4294967296)[dartx.truncate]() & dart.notNull(_Random._MASK32);
         tmplow = dart.notNull(this[_lo]) * 1037;
         this[_lo] = dart.notNull(tmplow) & dart.notNull(_Random._MASK32);
-        this[_hi] = dart.notNull(this[_hi]) * 1037 + ((dart.notNull(tmplow) - dart.notNull(this[_lo])) / 4294967296).truncate() & dart.notNull(_Random._MASK32);
+        this[_hi] = dart.notNull(this[_hi]) * 1037 + ((dart.notNull(tmplow) - dart.notNull(this[_lo])) / 4294967296)[dartx.truncate]() & dart.notNull(_Random._MASK32);
         this[_lo] = dart.notNull(this[_lo]) ^ dart.notNull(low);
         this[_hi] = dart.notNull(this[_hi]) ^ dart.notNull(high);
       } while (seed != empty_seed);
       if (this[_hi] == 0 && this[_lo] == 0) {
         this[_lo] = 23063;
       }
       this[_nextState]();
       this[_nextState]();
       this[_nextState]();
       this[_nextState]();
     }
     [_nextState]() {
       let tmpHi = 4294901760 * dart.notNull(this[_lo]);
       let tmpHiLo = dart.notNull(tmpHi) & dart.notNull(_Random._MASK32);
       let tmpHiHi = dart.notNull(tmpHi) - dart.notNull(tmpHiLo);
       let tmpLo = 55905 * dart.notNull(this[_lo]);
       let tmpLoLo = dart.notNull(tmpLo) & dart.notNull(_Random._MASK32);
       let tmpLoHi = dart.notNull(tmpLo) - dart.notNull(tmpLoLo);
       let newLo = dart.notNull(tmpLoLo) + dart.notNull(tmpHiLo) + dart.notNull(this[_hi]);
       this[_lo] = dart.notNull(newLo) & dart.notNull(_Random._MASK32);
       let newLoHi = dart.notNull(newLo) - dart.notNull(this[_lo]);
-      this[_hi] = ((dart.notNull(tmpLoHi) + dart.notNull(tmpHiHi) + dart.notNull(newLoHi)) / dart.notNull(_POW2_32)).truncate() & dart.notNull(_Random._MASK32);
+      this[_hi] = ((dart.notNull(tmpLoHi) + dart.notNull(tmpHiHi) + dart.notNull(newLoHi)) / dart.notNull(_POW2_32))[dartx.truncate]() & dart.notNull(_Random._MASK32);
       dart.assert(dart.notNull(this[_lo]) < dart.notNull(_POW2_32));
       dart.assert(dart.notNull(this[_hi]) < dart.notNull(_POW2_32));
     }
     nextInt(max) {
       if (dart.notNull(max) <= 0 || dart.notNull(max) > dart.notNull(_POW2_32)) {
         dart.throw(new core.RangeError(`max must be in range 0 < max ≤ 2^32, was ${max}`));
       }
       if ((dart.notNull(max) & dart.notNull(max) - 1) == 0) {
         this[_nextState]();
         return dart.notNull(this[_lo]) & dart.notNull(max) - 1;
@@ skipping 55 matching lines @@
   exports.sin = sin;
   exports.cos = cos;
   exports.tan = tan;
   exports.acos = acos;
   exports.asin = asin;
   exports.atan = atan;
   exports.sqrt = sqrt;
   exports.exp = exp;
   exports.log = log;
 });