Before, attempting to build the code using Yasm as the assembler would
result in warnings like this:
warning : no non-local label before `.chacha20_consts'
Precede the local labels with a non-local label to suppress these
warnings.
It isn't clear why these labels are defined as local labels instead of
regular labels. Making them non-local may be a better idea.
For reference, Yasm's interpretation of local labels is described
succinctly at
https://www.tortall.net/projects/yasm/manual/html/nasm-local-label.html.
Change-Id: Ifc92de7fd7379859fe33f1137ab20b6ec282cd0b
Reviewed-on: https://boringssl-review.googlesource.com/13384
Reviewed-by: Adam Langley <agl@google.com>
644539191b