fixed to test features, not CPU model

The 'vmovntdq' was only passing due to a fluke in
SandyBridge codegen that splits 32-byte stores in half, 
but that meant that the test was not correctly checking
for the 32-byte store that we thought we were generating.

The lax checking in this file will be addressed in
another commit. There are bigger problems here.

llvm-svn: 232644