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

test/cctest/wasm/test-run-wasm.cc

Index: test/cctest/wasm/test-run-wasm.cc
diff --git a/test/cctest/wasm/test-run-wasm.cc b/test/cctest/wasm/test-run-wasm.cc
index d9d9db80e15e54a9cbe947d96ee9187b9ea82fea..109a47144fadc25c4051b897b72b0f3260af98bc 100644
--- a/test/cctest/wasm/test-run-wasm.cc
+++ b/test/cctest/wasm/test-run-wasm.cc
@@ -2632,6 +2632,39 @@ WASM_EXEC_TEST(CallIndirect_NoTable) {
   CHECK_TRAP(r.Call(2));
 }
 
+WASM_EXEC_TEST(CallIndirect_canonical) {
+  TestSignatures sigs;
+  TestingModule module(execution_mode);
+
+  WasmFunctionCompiler t1(sigs.i_ii(), &module);
+  BUILD(t1, WASM_I32_ADD(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)));
+  t1.CompileAndAdd(/*sig_index*/ 0);
+
+  WasmFunctionCompiler t2(sigs.i_ii(), &module);
+  BUILD(t2, WASM_I32_SUB(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)));
+  t2.CompileAndAdd(/*sig_index*/ 1);
+
+  // Signature table.
+  module.AddSignature(sigs.i_ii());
+  module.AddSignature(sigs.i_ii());
+
+  // Function table.
+  uint16_t indirect_function_table[] = {0, 1, 0, 1};
+  module.AddIndirectFunctionTable(indirect_function_table,
+                                  arraysize(indirect_function_table));
+  module.PopulateIndirectFunctionTable();
+
+  // Builder the caller function.
+  WasmRunner<int32_t> r(&module, MachineType::Int32());
+  BUILD(r, WASM_CALL_INDIRECT2(1, WASM_GET_LOCAL(0), WASM_I8(77), WASM_I8(11)));
+
+  CHECK_EQ(88, r.Call(0));
+  CHECK_EQ(66, r.Call(1));
+  CHECK_EQ(88, r.Call(2));
+  CHECK_EQ(66, r.Call(3));
+  CHECK_TRAP(r.Call(4));
+}
+
 WASM_EXEC_TEST(F32Floor) {
   WasmRunner<float> r(execution_mode, MachineType::Float32());
   BUILD(r, WASM_F32_FLOOR(WASM_GET_LOCAL(0)));