SSE1 test suite.

Adds a _failing_ test which refers to _each_ intrinsic provided by Intel Intrinsic reference in `xmmintrin.h`. Not to be merged yet , unless we skip the test from being run in the suite. The test passes if built and run natively with gcc or clang.
This would be a little nicer as _mm_set1_ps(*__p), so that we don't depend on redundant load elimination to get the splat pattern match.