Bug 836658: Use -arch:IA32 on VS2012 to avoid requiring SSE2. r=wtc.
Bug 836658: Use -arch:IA32 on VS2012 to avoid requiring SSE2. r=wtc.

ekr/nss-old,ekr/nss-old,ekr/nss-old,ekr/nss-old,ekr/nss-old,ekr/nss-old,ekr/nss-old