[aarch64-port-dev ] RFR: 8146886: aarch64: fails to build following 8136525 and 8139864

[Edward Nevill]

Hi,

The following webrev fixed several build failures in aarch64 following recent merges.

Webrev: http://cr.openjdk.java.net/~enevill/8146886/webrev/
Jira: https://bugs.openjdk.java.net/browse/JDK-8146886

Testing by building release and festdebug versions and by running jtreg hotspot and langtools.

Jtreg hotspot: Test results: passed: 1,068; failed: 16; error: 15
JTreg langtools: Test results: passed: 3,358; failed: 1; error: 4

OK to push?
Ed.