notice simd signal from fastcomp

Author: kripken

emscripten.py

@@ -804,6 +804,9 @@ def fix_dot_zero(m):
       map(lambda x: x[1:], metadata['implementedFunctions'])
     )
   ) + map(lambda x: x[1:], metadata['externs'])
+  if metadata['simd']:
+    settings['SIMD'] = 1
+    settings['ASM_JS'] = 2
 
   # Save settings to a file to work around v8 issue 1579
   settings_file = temp_files.get('.txt').name

src/jsifier.js

@@ -1871,7 +1871,7 @@ function JSify(data, functionsOnly) {
       print('// Warning: printing of i64 values may be slightly rounded! No deep i64 math used, so precise i64 code not included');
       print('var i64Math = null;');
     }
-    if (Types.usesSIMD) {
+    if (Types.usesSIMD || SIMD) {
       print(read('simd.js'));
     }