Update listing of when SSSE3 and SSE4.1 first became available

Update listing of when SSSE3 and SSE4.1 first became available

SSSE3 was first available on the original Intel Core 2 processors, so
add the "Merom" codename. SSE4.1 was available on the 45 nm shrink of
those processors, codename "Penryn", not on the next architecture.

Change-Id: I5fd92db62aa409b7f4e46f9b24d960519177f811
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>