Default to 64-bit for tests of methods with varying ISAs for valgrind.

The size of the created methods will technically not be correct, but
they will be larger than necessary when the target is changed to 32-bit,
so valgrind will not complain.

Bug: 19368740
Change-Id: Ic78867b4700248ec6d70f5d7f6d87ce9447ac448
2 files changed