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 actually corresponds to the SIMD.float32x4.loadX function in SIMD.js. Could you add a TODO mentioning that we should expose APIs for that?