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.
SIMD.js doesn't have float32x2, and I'm not aware of anyone having proposed it, so it seems premature to add float32x2 here.