[Wasm] Convert many of the fixed-size values to LEB128.

src/wasm/ast-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/base/platform/elapsed-timer.h"
 #include "src/signature.h"
 
 #include "src/bit-vector.h"
 #include "src/flags.h"
 #include "src/handles.h"
@@ skipping 182 matching lines @@
       return true;
     }
     error(pc, pc + 1, "invalid break depth");
     return false;
   }
 
   bool Validate(const byte* pc, BranchTableOperand& operand,
                 size_t block_depth) {
     // Verify table.
     for (uint32_t i = 0; i < operand.table_count + 1; i++) {
-      uint16_t target = operand.read_entry(this, i);
+      uint32_t target = operand.read_entry(this, i);
       if (target >= block_depth) {
         error(operand.table + i * 2, "improper branch in br_table");
         return false;
       }
     }
     return true;
   }
 
   int OpcodeArity(const byte* pc) {
 #define DECLARE_ARITY(name, ...)                          \
@@ skipping 886 matching lines @@
           bool build_switch = operand.table_count > 0;
           TFNode* sw = nullptr;
           if (build_switch) {
             sw = BUILD(Switch, operand.table_count + 1, p->last()->node);
           }
 
           // Process the targets of the break table.
           SsaEnv* prev = ssa_env_;
           SsaEnv* copy = Steal(prev);
           for (uint32_t i = 0; i < operand.table_count + 1; i++) {
-            uint16_t target = operand.read_entry(this, i);
+            uint32_t target = operand.read_entry(this, i);
             SsaEnv* env = copy;
             if (build_switch) {
               ssa_env_ = env = Split(env);
               env->control = i == operand.table_count ? BUILD(IfDefault, sw)
                                                       : BUILD(IfValue, i, sw);
             }
             SsaEnv* tenv = blocks_[blocks_.size() - target - 1].ssa_env;
             Goto(env, tenv);
           }
           ssa_env_ = prev;
@@ skipping 588 matching lines @@
 BitVector* AnalyzeLoopAssignmentForTesting(Zone* zone, size_t num_locals,
                                            const byte* start, const byte* end) {
   FunctionBody body = {nullptr, nullptr, nullptr, start, end};
   SR_WasmDecoder decoder(zone, nullptr, body);
   return decoder.AnalyzeLoopAssignmentForTesting(start, num_locals);
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8