tree f3f1e2989c7e750a85a3e370e404fc54320f864a
parent c1d8c5b0e0ff4177ec06eed58ebcfd5a75b7f231
author David Benjamin <davidben@google.com> 1556213937 -0500
committer Adam Langley <agl@google.com> 1556301879 +0000

Check for x18 usage in aarch64 assembly.

r18 (accessed as x18 and w18) is the platform register. The ABI testing
framework cannot touch it, but we can statically check that our assembly
leaves it alone.

Also fix a comment which cited the wrong register.

Change-Id: Iba2714eef5db19e2e93a6838d12a4e7c9011cc67
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/35764
Reviewed-by: Adam Langley <agl@google.com>