Penryn doesn't support sse4.2, don't enable it in the first place.

While the code took care of disabling the sse42 flag it didn't know
about popcnt. This broke -march=native on penryn.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@147531 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed