[test262] skip two Intl.NumberFormat tests

Currently try bots [1] are failing on these tests and no CLs can be landed to V8. It looks like these tests were added recently.
Based on https://bugs.chromium.org/p/v8/issues/detail?id=6015, it's known issue in V8 implementation, so mark them as needs investigation.

[1] https://build.chromium.org/p/tryserver.v8/builders/v8_linux64_asan_rel_ng_triggered/builds/16490/steps/Test262%20-%20no%20variants

BUG=v8:6015,v8:6016
TBR=adamk@chromium.org,littledan@chromium.org
NOTREECHECKS=true

Review-Url: https://codereview.chromium.org/2717773002
Cr-Commit-Position: refs/heads/master@{#43423}

test/test262/local-tests/test/intl402/NumberFormat/default-currency-maximum-fraction-digits.js

+// Copyright 2017 the V8 project authors. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+esid: ECMA-402 #sec-setnfdigitoptions
+description: >
+    When a currency is used in Intl.NumberFormat and minimumFractionDigits is
+    not provided, maximumFractionDigits should be range-checked against it.
+include: [assert.js]
+---*/
+
+assert.throws(RangeError,
+              () => new Intl.NumberFormat('en', {
+                  style: 'currency',
+                  currency: 'USD',
+                  maximumFractionDigits: 1
+              }));

test/test262/local-tests/test/intl402/NumberFormat/fraction-digit-options-read-once.js

+// Copyright 2017 the V8 project authors. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+esid: ECMA-402 #sec-setnfdigitoptions
+description: >
+    The maximum and minimum fraction digits properties should be read from
+    the options bag exactly once from the NumberFormat constructor.
+    Regression test for https://bugs.chromium.org/p/v8/issues/detail?id=6015
+include: [assert.js]
+---*/
+
+var minCounter = 0;
+var maxCounter = 0;
+new Intl.NumberFormat("en", { get minimumFractionDigits() { minCounter++ },
+                              get maximumFractionDigits() { maxCounter++ } });
+assert.sameValue(1, minCounter);
+assert.sameValue(1, maxCounter);

test/test262/test262.status

@@ -548,6 +548,8 @@
   'intl402/NumberFormat/11.2.3_b': [FAIL],
   'intl402/NumberFormat/prototype/11.3_a': [FAIL],
   'intl402/String/prototype/localeCompare/13.1.1_7': [PASS, FAIL],
+  'intl402/NumberFormat/default-currency-maximum-fraction-digits': [PASS, FAIL],
+  'intl402/NumberFormat/fraction-digit-options-read-once': [PASS, FAIL],
 
   ##################### DELIBERATE INCOMPATIBILITIES #####################