[wasm-simd] Fix typo in constructing SIMD Global

The value should be v128 according to
https://github.com/WebAssembly/simd/blob/master/proposals/simd/SIMD.md#global-constructor.

Change-Id: I9d29905daaaf19cdcaf686991f4887c3e709d2d6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2436638Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70184}

test/mjsunit/wasm/simd-errors.js

@@ -61,5 +61,5 @@ load("test/mjsunit/wasm/wasm-module-builder.js");
 })();
 
 (function TestS128GlobalConstructor() {
-  assertThrows(() => new WebAssembly.Global({value: 'i128'}), TypeError);
+  assertThrows(() => new WebAssembly.Global({value: 'v128'}), TypeError);
 })();