Update SIMD.js code generation due to API update
Handle the undef vector types.
Merge pull request #45 from huningxin/incoming

Update SIMD code generation due to simd.js update and fix the undef handling
1.23.1
align the current stack frame to something larger than the default, when necessary
emit a string describing why code cannot validate, when it can't
1.23.2
Generate SIMD.js shuffle or shuffleMix for LLVM shufflevector instruction.
Merge pull request #47 from huningxin/simd

Generate SIMD.js shuffle and shuffleMix for LLVM shufflevector instruction.
1.23.3
Add a emscripten_float32x4_not function

If we have andNot, we should have plain not too. And not is needed by
some functions I'm adding to Emscripten's xmmintrin.h.
1.23.4
1.23.5
do nothing on SIMD return values, and fix doing nothing to coerce SIMD values
1.24.0