Expose SIMD.Float32x4 type to Javascript.

src/macros.py

Index: src/macros.py
diff --git a/src/macros.py b/src/macros.py
index 5e28c66a83a445530fbddb2518f8efa23ad6dae8..91b4132563911144361c1e9b41e995601113bdf3 100644
--- a/src/macros.py
+++ b/src/macros.py
@@ -90,6 +90,7 @@ macro IS_NULL(arg)              = (arg === null);
 macro IS_NULL_OR_UNDEFINED(arg) = (arg == null);
 macro IS_UNDEFINED(arg)         = (arg === (void 0));
 macro IS_NUMBER(arg)            = (typeof(arg) === 'number');
+macro IS_FLOAT32X4(arg)         = (typeof(arg) === 'float32x4');
 macro IS_STRING(arg)            = (typeof(arg) === 'string');
 macro IS_BOOLEAN(arg)           = (typeof(arg) === 'boolean');
 macro IS_SYMBOL(arg)            = (typeof(arg) === 'symbol');
@@ -103,6 +104,7 @@ macro IS_MAP(arg)               = (%_ClassOf(arg) === 'Map');
 macro IS_WEAKMAP(arg)           = (%_ClassOf(arg) === 'WeakMap');
 macro IS_WEAKSET(arg)           = (%_ClassOf(arg) === 'WeakSet');
 macro IS_NUMBER_WRAPPER(arg)    = (%_ClassOf(arg) === 'Number');
+macro IS_FLOAT32X4_WRAPPER(arg) = (%_ClassOf(arg) === 'Float32x4');
 macro IS_STRING_WRAPPER(arg)    = (%_ClassOf(arg) === 'String');
 macro IS_SYMBOL_WRAPPER(arg)    = (%_ClassOf(arg) === 'Symbol');
 macro IS_BOOLEAN_WRAPPER(arg)   = (%_ClassOf(arg) === 'Boolean');