MIPS64: Fix random failures of fannkuch.js.

test/mjsunit/math-abs.js

Index: test/mjsunit/math-abs.js
diff --git a/test/mjsunit/math-abs.js b/test/mjsunit/math-abs.js
index b90ae0917c4d513c4d880f8a79e71a895dc7986c..09e6416c8b5794ba2ad19ce229523e3ec8e64e70 100644
--- a/test/mjsunit/math-abs.js
+++ b/test/mjsunit/math-abs.js
@@ -120,3 +120,19 @@ assertEquals(1, foo2());
 assertEquals(1, foo2());
 %OptimizeFunctionOnNextCall(foo2);
 assertEquals(1, foo2());
+
+
+// Regression test for Integer input of Math.abs on mips64.
+function absHalf(bits) {
+  var x = 1 << (bits - 1);
+  var half = Math.abs(x);
+  return half;
+
+}
+
+// Create minimum integer input for abs() using bitwise operations
+// that sould overflow.

[Jakob Kummerow, 2015/06/19 14:50:25]

nit: s/sould/should/

+bits = 32;
+for (i = 0; i < 1000; i++) {

[Jakob Kummerow, 2015/06/19 14:50:25]

Please keep the testcase fast:

assertEquals(2147483648, absHalf(bits));
assertEquals(2147483648, absHalf(bits));
%OptimizeFunctionOnNextCall(absHalf);
assertEquals(2147483648, absHalf(bits));

+  assertEquals(2147483648, absHalf(bits));
+}