[wasm] Extra LEB utilities to leb-helper.h

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 197 matching lines @@
 }
 
 inline TreeResult BuildTFGraph(base::AccountingAllocator* allocator,
                                TFBuilder* builder, ModuleEnv* module,
                                FunctionSig* sig, const byte* start,
                                const byte* end) {
   FunctionBody body = {module, sig, nullptr, start, end};
   return BuildTFGraph(allocator, builder, body);
 }
 
-enum ReadUnsignedLEB128ErrorCode { kNoError, kInvalidLEB128, kMissingLEB128 };
-
-ReadUnsignedLEB128ErrorCode ReadUnsignedLEB128Operand(const byte*, const byte*,
-                                                      int*, uint32_t*);
-
 struct AstLocalDecls {
   // The size of the encoded declarations.
   uint32_t decls_encoded_size;  // size of encoded declarations
 
   // Total number of locals.
   uint32_t total_local_count;
 
   // List of {local type, count} pairs.
   ZoneVector<std::pair<LocalType, uint32_t>> local_types;
 
@@ skipping 10 matching lines @@
 int OpcodeLength(const byte* pc, const byte* end);
 
 // Computes the arity (number of sub-nodes) of the opcode at the given address.
 int OpcodeArity(ModuleEnv* module, FunctionSig* sig, const byte* pc,
                 const byte* end);
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_AST_DECODER_H_