Expand reporting of the Intel instruction set extensions

Detection for most of them is free because we're loading the entire
registers anyway. The only exception is AVX512VBMI, which is in a new
register we hadn't yet read from.

I've also added the new GCC names so they can be used with
QT_FUNCTION_TARGET. The only two exceptions are "movbe" and "popcnt",
which are extremely restricted in use and we are not likely to have code
dedicated to using them.

Change-Id: Ib306f8f647014b399b87ffff13f1d8fd29e58be0
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>