Although x86masm.pl exists, upstream's documentation suggest only x86nasm.pl is supported. Yasm seems to handle it fine with a small change. Change-Id: Ia77be57c6b743527225924b2b398f2f07a084a7f Reviewed-on: https://boringssl-review.googlesource.com/2092 Reviewed-by: Adam Langley <agl@google.com>kris/onging/CECPQ3_patch15