[wasm] Canonicalize function signature indices for matching in indirect calls.

test/cctest/wasm/wasm-run-utils.h

 // Copyright 2016 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 WASM_RUN_UTILS_H
 #define WASM_RUN_UTILS_H
 
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
@@ skipping 209 matching lines @@
         static_cast<int>(this->module->functions[index].sig->parameter_count()),
         exportedSig, module_object);
     return ret;
   }
 
   void SetFunctionCode(uint32_t index, Handle<Code> code) {
     instance->function_code[index] = code;
   }
 
   void AddIndirectFunctionTable(uint16_t* functions, uint32_t table_size) {
-    module_.function_tables.push_back(
-        {table_size, table_size, std::vector<int32_t>(), false, false});
+    module_.function_tables.push_back({table_size, table_size,
+                                       std::vector<int32_t>(), false, false,
+                                       SignatureMap()});
+    WasmIndirectFunctionTable& table = module_.function_tables.back();
     for (uint32_t i = 0; i < table_size; ++i) {
-      module_.function_tables.back().values.push_back(functions[i]);
+      table.values.push_back(functions[i]);
+      table.map.FindOrInsert(module_.functions[functions[i]].sig);
     }
 
     Handle<FixedArray> values = BuildFunctionTable(
         isolate_, static_cast<int>(module_.function_tables.size() - 1),
         &module_);
     instance->function_tables.push_back(values);
   }
 
   void PopulateIndirectFunctionTable() {
     for (uint32_t i = 0; i < instance->function_tables.size(); i++) {
@@ skipping 537 matching lines @@
 // interpreter.
 #define WASM_EXEC_TEST(name)                                               \
   void RunWasm_##name(WasmExecutionMode execution_mode);                   \
   TEST(RunWasmCompiled_##name) { RunWasm_##name(kExecuteCompiled); }       \
   TEST(RunWasmInterpreted_##name) { RunWasm_##name(kExecuteInterpreted); } \
   void RunWasm_##name(WasmExecutionMode execution_mode)
 
 }  // namespace
 
 #endif