lib: remove simd support from util.format()

Upstream V8 is removing SIMD support.  Be proactive and follow suit.

Refs: https://bugs.chromium.org/p/v8/issues/detail?id=4124
PR-URL: #11346
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: bnoordhuis

lib/util.js

@@ -18,41 +18,6 @@ const inspectDefaultOptions = Object.seal({
 });
 
 var Debug;
-var simdFormatters;
-
-// SIMD is only available when --harmony_simd is specified on the command line
-// and the set of available types differs between v5 and v6, that's why we use
-// a map to look up and store the formatters.  It also provides a modicum of
-// protection against users monkey-patching the SIMD object.
-if (typeof global.SIMD === 'object' && global.SIMD !== null) {
-  simdFormatters = new Map();
-
-  const make =
-    (extractLane, count) => (ctx, value, recurseTimes, visibleKeys, keys) => {
-      const output = new Array(count);
-      for (var i = 0; i < count; i += 1)
-        output[i] = formatPrimitive(ctx, extractLane(value, i));
-      return output;
-    };
-
-  const countPerType = {
-    Bool16x8: 8,
-    Bool32x4: 4,
-    Bool8x16: 16,
-    Float32x4: 4,
-    Int16x8: 8,
-    Int32x4: 4,
-    Int8x16: 16,
-    Uint16x8: 8,
-    Uint32x4: 4,
-    Uint8x16: 16
-  };
-
-  for (const key in countPerType) {
-    const type = global.SIMD[key];
-    simdFormatters.set(type, make(type.extractLane, countPerType[key]));
-  }
-}
 
 function tryStringify(arg) {
   try {
@@ -508,7 +473,6 @@ function formatValue(ctx, value, recurseTimes) {
       braces = ['{', '}'];
       formatter = formatPromise;
     } else {
-      let maybeSimdFormatter;
       if (binding.isMapIterator(value)) {
         constructor = { name: 'MapIterator' };
         braces = ['{', '}'];
@@ -519,11 +483,6 @@ function formatValue(ctx, value, recurseTimes) {
         braces = ['{', '}'];
         empty = false;
         formatter = formatCollectionIterator;
-      } else if (simdFormatters &&
-                 typeof constructor === 'function' &&
-                 (maybeSimdFormatter = simdFormatters.get(constructor))) {
-        braces = ['[', ']'];
-        formatter = maybeSimdFormatter;
       } else {
         // Unset the constructor to prevent "Object {...}" for ordinary objects.
         if (constructor && constructor.name === 'Object')