Disable LTO for the vDSO. Note that while we could use Clang's LTO
for the 64-bit vDSO, it won't add noticeable benefit for the small
amount of C code.
Bug: 145210207
Change-Id: I97df448374c6ee44920c92db361551728562178a
Link: https://lore.kernel.org/lkml/20201013003203.4168817-24-samitolvanen@google.com/
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
5fbc1d78a4