[wasm] Add utilities to print out WASM ast directly from the bytes.

test/cctest/wasm/test-signatures.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 TEST_SIGNATURES_H
 #define TEST_SIGNATURES_H
 
 #include "src/signature.h"
 #include "src/wasm/wasm-opcodes.h"
 
@@ skipping 54 matching lines @@
   FunctionSig* i_ll() { return &sig_i_ll; }
 
   FunctionSig* f_ff() { return &sig_f_ff; }
   FunctionSig* d_dd() { return &sig_d_dd; }
 
   FunctionSig* v_v() { return &sig_v_v; }
   FunctionSig* v_i() { return &sig_v_i; }
   FunctionSig* v_ii() { return &sig_v_ii; }
   FunctionSig* v_iii() { return &sig_v_iii; }
 
+  FunctionSig* many(Zone* zone, LocalType ret, LocalType param, int count) {
+    FunctionSig::Builder builder(zone, ret == kAstStmt ? 0 : 1, count);
+    if (ret != kAstStmt) builder.AddReturn(ret);
+    for (int i = 0; i < count; i++) {
+      builder.AddParam(param);
+    }
+    return builder.Build();
+  }
+
  private:
   LocalType kIntTypes4[4];
   LocalType kLongTypes4[4];
   LocalType kFloatTypes4[4];
   LocalType kDoubleTypes4[4];
   LocalType kIntLongTypes4[4];
   LocalType kIntFloatTypes4[4];
   LocalType kIntDoubleTypes4[4];
 
   FunctionSig sig_i_v;
@@ skipping 17 matching lines @@
   FunctionSig sig_v_v;
   FunctionSig sig_v_i;
   FunctionSig sig_v_ii;
   FunctionSig sig_v_iii;
 };
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // TEST_SIGNATURES_H