tree 5d69b91fec07b97c1521a34eccb557e246faac07
parent a9a7faddda4f209e0df5ae73da706cbe39a40b8f
author Christopher Ferris <cferris@google.com> 1705536919 -0800
committer Christopher Ferris <cferris@google.com> 1706916660 -0800

Add support for riscv 64 vlenb.

The vlenb register is used for some unwinding information, so add
gathering it. Also, rename some of the machine constants to use
better names.

Added an offline test that uses the vlenb register to do the unwind.
Added a remote unwind test for the bionic local terminate.

Bug: 318768887

Test: Ran unit tests.
Test: Ran 137-cfi and verified a full stack generated.
Change-Id: Ia72394033b4be46a3f29d519879b88ed933ab5ce