test: mark new test as flaky for chakracore

Author: jackhorton

test/parallel/parallel.status

@@ -101,6 +101,7 @@ test-vm-function-declaration : PASS,FLAKY
 test-vm-getters : PASS,FLAKY
 test-vm-global-define-property : PASS,FLAKY
 test-vm-global-non-writable-properties : PASS,FLAKY
+test-vm-global-property-interceptors.js : PASS,FLAKY
 test-vm-harmony-symbols : PASS,FLAKY
 test-vm-indexed-properties : PASS,FLAKY
 test-vm-proxies : PASS,FLAKY