[wasm] Remove special memory type for (internal) globals and use local type instead.

src/wasm/ast-decoder.h

 // 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.
 
 #ifndef V8_WASM_AST_DECODER_H_
 #define V8_WASM_AST_DECODER_H_
 
 #include "src/signature.h"
 #include "src/wasm/decoder.h"
 #include "src/wasm/wasm-opcodes.h"
@@ skipping 61 matching lines @@
   unsigned length;
   inline ImmF64Operand(Decoder* decoder, const byte* pc) {
     value = bit_cast<double>(decoder->checked_read_u64(pc, 1, "immf64"));
     length = 8;
   }
 };
 
 struct GlobalIndexOperand {
   uint32_t index;
   LocalType type;
-  MachineType machine_type;
   unsigned length;
 
   inline GlobalIndexOperand(Decoder* decoder, const byte* pc) {
     index = decoder->checked_read_u32v(pc, 1, &length, "global index");
     type = kAstStmt;
-    machine_type = MachineType::None();
   }
 };
 
 struct Control;
 struct BreakDepthOperand {
   uint32_t arity;
   uint32_t depth;
   Control* target;
   unsigned length;
   inline BreakDepthOperand(Decoder* decoder, const byte* pc) {
@@ skipping 243 matching lines @@
   }
 
   bool has_next() { return pc_ < end_; }
 };
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_AST_DECODER_H_