Test for required hwcaps on ARMv8

Several optional ARMv7 features are now required on ARMv8.  Ensure
getauxval(AT_HWCAP) works on ARMv8 devices and reports the required
flags to 32-bit processes.

Bug: 13679666
Bug: 15940803

Change-Id: I2947809b3b1a09121765fc1adaf26e88ea639f04
Signed-off-by: Greg Hackmann <ghackmann@google.com>
3 files changed