ARM64: Generate optimized code for Math.floor and Math.round with double outputs.

test/mjsunit/math-floor-part3.js

Index: test/mjsunit/math-floor-part3.js
diff --git a/test/mjsunit/math-floor-part3.js b/test/mjsunit/math-floor-part3.js
index db2592343355d8d2273a6d01424f7a6d2f5da486..0b0e687f9ea5b2a81affe021481a48e67aba3da7 100644
--- a/test/mjsunit/math-floor-part3.js
+++ b/test/mjsunit/math-floor-part3.js
@@ -37,6 +37,15 @@ function testFloor(expect, input) {
   assertEquals(expect, test(input));
   %OptimizeFunctionOnNextCall(test);
   assertEquals(expect, test(input));
+
+  var test_double_output = new Function(
+      'n',
+      '"' + (test_id++) + '";return Math.floor(n) + -0.0');
+  assertEquals(expect, test_double_output(input));
+  assertEquals(expect, test_double_output(input));
+  assertEquals(expect, test_double_output(input));
+  %OptimizeFunctionOnNextCall(test_double_output);
+  assertEquals(expect, test_double_output(input));
 }
 
 function zero() {