Check in codegen test expectations.

test/codegen/expect/corelib/bit_twiddling_bigint_test.js

Index: test/codegen/expect/corelib/bit_twiddling_bigint_test.js
diff --git a/test/codegen/expect/corelib/bit_twiddling_bigint_test.js b/test/codegen/expect/corelib/bit_twiddling_bigint_test.js
new file mode 100644
index 0000000000000000000000000000000000000000..451fd63df6efb40b2211bd3b7a38702e26b5cf83
--- /dev/null
+++ b/test/codegen/expect/corelib/bit_twiddling_bigint_test.js
@@ -0,0 +1,63 @@
+dart_library.library('corelib/bit_twiddling_bigint_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__bit_twiddling_bigint_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const bit_twiddling_bigint_test = Object.create(null);
+  let intAnddynamicTodynamic = () => (intAnddynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [core.int, dart.dynamic])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  let dynamicAnddynamicAnddynamicTodynamic = () => (dynamicAnddynamicAnddynamicTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [dart.dynamic, dart.dynamic, dart.dynamic])))();
+  bit_twiddling_bigint_test.testBitLength = function() {
+    function check(i, width) {
+      expect$.Expect.equals(width, i[dartx.bitLength], dart.str`${i}.bitLength ==  ${width}`);
+      expect$.Expect.equals(width, (-dart.notNull(i) - 1)[dartx.bitLength], dart.str`(~${i}).bitLength == ${width}`);
+    }
+    dart.fn(check, intAnddynamicTodynamic());
+    check(72057594037927935, 56);
+    check(18446744073709551615, 64);
+    check(4722366482869645213695, 72);
+    check(4722366482869645213696, 73);
+    check(4722366482869645213697, 73);
+    check(5708990770823839524233143877797980545530986494, 152);
+    check(5708990770823839524233143877797980545530986495, 152);
+    check(5708990770823839524233143877797980545530986496, 153);
+    check(5708990770823839524233143877797980545530986497, 153);
+  };
+  dart.fn(bit_twiddling_bigint_test.testBitLength, VoidTodynamic());
+  bit_twiddling_bigint_test.testToUnsigned = function() {
+    function checkU(src, width, expected) {
+      expect$.Expect.equals(expected, dart.dsend(src, 'toUnsigned', width));
+    }
+    dart.fn(checkU, dynamicAnddynamicAnddynamicTodynamic());
+    checkU(1208925891672223212634113, 2, 1);
+    checkU(1208925963729817250562049, 60, 144115188075855873);
+    checkU(1208925963729817250562049, 59, 144115188075855873);
+    checkU(1208925963729817250562049, 58, 144115188075855873);
+    checkU(1208925963729817250562049, 57, 1);
+  };
+  dart.fn(bit_twiddling_bigint_test.testToUnsigned, VoidTodynamic());
+  bit_twiddling_bigint_test.testToSigned = function() {
+    function checkS(src, width, expected) {
+      expect$.Expect.equals(expected, dart.dsend(src, 'toSigned', width), dart.str`${src}.toSigned(${width}) == ${expected}`);
+    }
+    dart.fn(checkS, dynamicAnddynamicAnddynamicTodynamic());
+    checkS(1208925891672223212634113, 2, 1);
+    checkS(1208925963729817250562049, 60, 144115188075855873);
+    checkS(1208925963729817250562049, 59, 144115188075855873);
+    checkS(1208925963729817250562049, 58, -144115188075855872 + 1);
+    checkS(1208925963729817250562049, 57, 1);
+  };
+  dart.fn(bit_twiddling_bigint_test.testToSigned, VoidTodynamic());
+  bit_twiddling_bigint_test.main = function() {
+    bit_twiddling_bigint_test.testBitLength();
+    bit_twiddling_bigint_test.testToUnsigned();
+    bit_twiddling_bigint_test.testToSigned();
+  };
+  dart.fn(bit_twiddling_bigint_test.main, VoidTodynamic());
+  // Exports:
+  exports.bit_twiddling_bigint_test = bit_twiddling_bigint_test;
+});