[V8] Implement SIMD Boolean vector types to allow mask registers.

src/wasm/module-decoder.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/wasm/module-decoder.h"
 #include "src/wasm/function-body-decoder-impl.h"
 
 #include "src/base/functional.h"
 #include "src/base/platform/platform.h"
 #include "src/flags.h"
@@ skipping 1012 matching lines @@
     ValueTypeCode t = static_cast<ValueTypeCode>(val);
     switch (t) {
       case kLocalI32:
         return kWasmI32;
       case kLocalI64:
         return kWasmI64;
       case kLocalF32:
         return kWasmF32;
       case kLocalF64:
         return kWasmF64;
-      case kLocalS128:
+      default:
         if (origin_ != kAsmJsOrigin && FLAG_wasm_simd_prototype) {
-          return kWasmS128;
-        } else {
-          error(pc_ - 1, "invalid local type");
-          return kWasmStmt;
+          switch (t) {
+            case kLocalS128:
+              return kWasmS128;
+            case kLocalS4:
+              return kWasmS4;
+            case kLocalS8:
+              return kWasmS8;
+            case kLocalS16:
+              return kWasmS16;
+            default:
+              break;
+          }
         }
-      default:
         error(pc_ - 1, "invalid local type");
         return kWasmStmt;
     }
   }
 
   // Parses a type entry, which is currently limited to functions only.
   FunctionSig* consume_sig() {
     if (!expect_u8("type form", kWasmFunctionTypeForm)) return nullptr;
     // parse parameter types
     uint32_t param_count =
@@ skipping 247 matching lines @@
     result.push_back({section_start, name_offset, name_length, payload_offset,
                       payload_length, section_length});
   }
 
   return result;
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8