Primarily stresses the NEON VABA instruction (using the arguments
with all bits set), which seems to be the most power hungry one.
Additionally stresses branches and unaligned LDR instructions with
all the bells and whistles in use (conditional execution, shifted
index and base register writeback).

Implemented both 32-bit and 64-bit variants. The 32-bit variant
is a little bit more power hungry because ARM64 does not support
conditional execution and base register writeback for this
particular variant of the LDR instruction.

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>