Fix compilation of poly1305 using go tip - it currently fails with: ./poly1305_arm.s:124: cannot reference SP without a symbol ./poly1305_arm.s:161: cannot reference SP without a symbol ./poly1305_arm.s:162: cannot reference SP without a symbol asm: asm: assembly of ./poly1305_arm.s failed Change-Id: I797dcf3641cc881b6cc192034b693ccf58317987 Reviewed-on: https://go-review.googlesource.com/10307 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Adam Langley <agl@golang.org>