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

src/compiler/wasm-compiler.cc

Index: src/compiler/wasm-compiler.cc
diff --git a/src/compiler/wasm-compiler.cc b/src/compiler/wasm-compiler.cc
index 3308d4393d001b0fbfd6c72e45ac4e32c730d1f9..dc23e0d2bf866f5de4c9aa14f8a9687aae62f6b2 100644
--- a/src/compiler/wasm-compiler.cc
+++ b/src/compiler/wasm-compiler.cc
@@ -2148,9 +2148,11 @@ Node* WasmGraphBuilder::CallIndirect(uint32_t index, Node** args, Node*** rets,
                                           Int32Constant(kPointerSizeLog2)),
                          Int32Constant(fixed_offset)),
         *effect_, *control_);
+    int32_t key = module_->module->function_tables[0].map_.Find(sig);
+    DCHECK_GE(key, 0);
     Node* sig_match =
         graph()->NewNode(machine->Word32Equal(),
-                         BuildChangeSmiToInt32(load_sig), Int32Constant(index));
+                         BuildChangeSmiToInt32(load_sig), Int32Constant(key));
     trap_->AddTrapIfFalse(wasm::kTrapFuncSigMismatch, sig_match, position);
   }