tree 22f028385c21a408bd228a79a94f02024cb3f39b
parent b3c1ff69d293d095c36371ecc21e0505c6156db7
author Christopher Ferris <cferris@google.com> 1461807062 -0700
committer Christopher Ferris <cferris@google.com> 1461814487 -0700

Add unwind information for r7 in arm syscalls.

It turns out that clang can emit code where the sp is saved in the r7
register on arm. Unfortunately, a lot of our syscalls overwrite that
value while the syscall is executing, so unwinding through that syscall
fails.

Update the syscall generation code to add unwinding information for
these uses.

Bug: 28411713
(cherry picked from commit 6e45d37decbbaf78ed4685213aebb1c9b5ccf8c2)

Change-Id: Ib775effc44c4113735fe9032b0602b9d63e3e390