[X86] Update fpclass intrinsic tests to chain their calls to the intrinsic...

[X86] Update fpclass intrinsic tests to chain their calls to the intrinsic rather than joining them with add.

The test cases try to test masked and unmasked isntructions at the same time. Previously the masked version relies on an extra fucntion parameter. Then the two results were combined with 'add'.

This patch gets rid of the second parameter and just passes the result of the first intrinsic into the mask argument of the second call. Then there's no need for an 'add'.

This configuration works a lot better with an upcoming patch to redefine the intrinsics to use vXi1 types for the output and mask argument.

llvm-svn: 335551