Revert "[wasm-simd] Pass decode if SSSE3 flag is set"

This reverts commit 0d059e07.

Reason for revert: Reverting as CheckHardwareSupportsSimd already contains the SSSE3 check.

Original change's description:
> [wasm-simd] Pass decode if SSSE3 flag is set
>
> Change-Id: Iafe2b5635287fea5bd3c687b4ed897edbce4b0aa
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2798978
> Reviewed-by: Zhi An Ng <zhin@chromium.org>
> Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#73781}

Change-Id: Ib227af90f2f35a7e63cb64acea8bbca9ff8ddd62
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2998503
Auto-Submit: Deepti Gandluri <gdeepti@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75491}

src/wasm/function-body-decoder-impl.h

@@ -3285,7 +3285,7 @@ class WasmFullDecoder : public WasmDecoder<validate> {
 
   DECODE(Simd) {
     CHECK_PROTOTYPE_OPCODE(simd);
-    if (!CheckHardwareSupportsSimd() && !FLAG_wasm_simd_ssse3_codegen) {
+    if (!CheckHardwareSupportsSimd()) {
       if (FLAG_correctness_fuzzer_suppressions) {
         FATAL("Aborting on missing Wasm SIMD support");
       }