Added TARGET_IS_64_BIT flag for x86_64 and aarch64

Change-Id: Ibdf9dafa3aeaf4b58b4a559ed05e36e2793bf6ed
Signed-off-by: Alexey Volkov <alexey.v.volkov@intel.com>
Merge "Added TARGET_IS_64_BIT flag for x86_64 and aarch64"
Merge Android Master.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>