Vary non-image Xmx for dex2oat on MIPS.
Vary non-image Xmx for dex2oat on MIPS.

The image Xmx is already fixed at 64m. The issue is in the non boot image case.

(cherry picked from commit 87f0d006f254dc49621a8cd925b5448344eb367f)

Change-Id: Id4a6d9e8edf00505198c3f3dd599cb7b7f06363a

xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build