Change LIBART_IMG_TARGET_BASE_ADDRESS to 0x70000000

Required for getting ART with valgrind on device working since
valgrind maps things in the 0x60000000 address range.

Bug: 13323732

Change-Id: I05efdbf3fe5acd1418e1d4ced5844154fb4c5d37
Increase the maximum javac heap size.

Java 7 needs more memory when you run some annotation tools.

Change-Id: Ia8b423244b9ce164500b24867fe2b3d10a5089ff
Merge "Increase the maximum javac heap size."
Merge "Change LIBART_IMG_TARGET_BASE_ADDRESS to 0x70000000"
auto-merger: merge in from aosp/master