Add SIMD.Float32x4 functions.

src/contexts.h

Index: src/contexts.h
diff --git a/src/contexts.h b/src/contexts.h
index 670f5a7c0ef693329eb1116a4df742965b39b145..e90122eeeaae90f34379eb4daf8e30b86e9e222a 100644
--- a/src/contexts.h
+++ b/src/contexts.h
@@ -125,6 +125,7 @@ enum BindingFlags {
   V(UINT8_CLAMPED_ARRAY_EXTERNAL_MAP_INDEX, Map,                               \
     uint8_clamped_array_external_map)                                          \
   V(DATA_VIEW_FUN_INDEX, JSFunction, data_view_fun)                            \
+  V(FLOAT32X4_FUNCTION_INDEX, JSFunction, float32x4_function)                  \
   V(SLOPPY_FUNCTION_MAP_INDEX, Map, sloppy_function_map)                       \
   V(SLOPPY_FUNCTION_WITH_READONLY_PROTOTYPE_MAP_INDEX, Map,                    \
     sloppy_function_with_readonly_prototype_map)                               \
@@ -389,6 +390,7 @@ class Context: public FixedArray {
     UINT8_CLAMPED_ARRAY_EXTERNAL_MAP_INDEX,
     DATA_VIEW_FUN_INDEX,
     SHARED_ARRAY_BUFFER_FUN_INDEX,
+    FLOAT32X4_FUNCTION_INDEX,
     MESSAGE_LISTENERS_INDEX,
     MAKE_MESSAGE_FUN_INDEX,
     GET_STACK_TRACE_LINE_INDEX,