Add support for riscv architecture in libunwindstack_unit_test

Some case tests fail because libunwindstack and it`s tests lack some
riscv architecture support.
Add the following code to make these tests pass.

Failed case:
	AndroidUnwinderTest.create
	AndroidUnwinderTest.verify_all_unwind_functions
	AndroidRemoteUnwinderTest.initialize_before
	AndroidRemoteUnwinderTest.skip_libraries
	AndroidRemoteUnwinderTest.suffix_ignore
	RegsRemoteTest.remote_get
	RegsRemoteTest.remote_get_arch

Test: make libunwindstack_unit_test

Change-Id: I19afcc49d90cb5fd9baecf5c246cddd9e788594b
Signed-off-by: liupengxiao <liupengxiao@eswincomputing.com>
3 files changed
tree: 7e8b0f424a122fefc1f0c47fa84d0cc39db60b7f
  1. libunwindstack/
  2. OWNERS
  3. PREUPLOAD.cfg