RFR: JDK 7: Add Support for Large Code Cache on aarch64

[Edward Nevill]

Hi,

The following webrev adds support for large code caches to JDK 7 for aarch64

http://cr.openjdk.java.net/~enevill/jdk7_largecode/webrev/

Tested with jtreg hotspot/langtools.

hotspot (original): Test results: passed: 297; failed: 12; error: 2
hotspot (patched): Test results: passed: 297; failed: 12; error: 2
hotspot (256m cache): Test results: passed: 298; failed: 11; error: 2

langtools (original): Test results: passed: 1,973; failed: 1
langtools (patched): Test results: passed: 1,973; failed: 1
langtools (256m cache): Test results: passed: 1,973; failed: 1

Only aarch64 files are touched in this patch.

OK to push?
Ed.