[X86] Don't use _MM_FROUND_CUR_DIRECTION in the intrinsics tests.

_MM_FROUND_CUR_DIRECTION is the behavior of the intrinsics that
don't take a rounding mode argument. So a better test
is using _MM_FROUND_NO_EXC with the SAE only intrinsics and
an explicit rounding mode with the intrinsics that support
embedded rounding mode.

llvm-svn: 364127